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172 lines
5.1 KiB
172 lines
5.1 KiB
From aaab5c3c9d2a2c6984f23ccbc79702610439bc65 Mon Sep 17 00:00:00 2001 |
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From: erouault <erouault> |
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Date: Sun, 27 Dec 2015 16:25:11 +0000 |
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Subject: [PATCH] * libtiff/tif_luv.c: fix potential out-of-bound writes in |
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decode functions in non debug builds by replacing assert()s by regular if |
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checks (bugzilla #2522). Fix potential out-of-bound reads in case of short |
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input data. |
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--- |
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ChangeLog | 7 +++++++ |
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libtiff/tif_luv.c | 55 ++++++++++++++++++++++++++++++++++++++++++++----------- |
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2 files changed, 51 insertions(+), 11 deletions(-) |
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Index: tiff-4.0.3/libtiff/tif_luv.c |
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=================================================================== |
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--- tiff-4.0.3.orig/libtiff/tif_luv.c 2016-03-23 10:13:56.868540963 -0400 |
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+++ tiff-4.0.3/libtiff/tif_luv.c 2016-03-23 10:13:56.864540914 -0400 |
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@@ -202,7 +202,11 @@ |
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if (sp->user_datafmt == SGILOGDATAFMT_16BIT) |
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tp = (int16*) op; |
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else { |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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tp = (int16*) sp->tbuf; |
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} |
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_TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); |
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@@ -211,9 +215,11 @@ |
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cc = tif->tif_rawcc; |
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/* get each byte string */ |
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for (shft = 2*8; (shft -= 8) >= 0; ) { |
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- for (i = 0; i < npixels && cc > 0; ) |
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+ for (i = 0; i < npixels && cc > 0; ) { |
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if (*bp >= 128) { /* run */ |
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- rc = *bp++ + (2-128); /* TODO: potential input buffer overrun when decoding corrupt or truncated data */ |
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+ if( cc < 2 ) |
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+ break; |
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+ rc = *bp++ + (2-128); |
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b = (int16)(*bp++ << shft); |
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cc -= 2; |
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while (rc-- && i < npixels) |
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@@ -223,6 +229,7 @@ |
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while (--cc && rc-- && i < npixels) |
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tp[i++] |= (int16)*bp++ << shft; |
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} |
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+ } |
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if (i != npixels) { |
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#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
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TIFFErrorExt(tif->tif_clientdata, module, |
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@@ -268,13 +275,17 @@ |
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if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
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tp = (uint32 *)op; |
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else { |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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tp = (uint32 *) sp->tbuf; |
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} |
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/* copy to array of uint32 */ |
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bp = (unsigned char*) tif->tif_rawcp; |
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cc = tif->tif_rawcc; |
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- for (i = 0; i < npixels && cc > 0; i++) { |
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+ for (i = 0; i < npixels && cc >= 3; i++) { |
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tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; |
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bp += 3; |
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cc -= 3; |
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@@ -325,7 +336,11 @@ |
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if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
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tp = (uint32*) op; |
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else { |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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tp = (uint32*) sp->tbuf; |
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} |
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_TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); |
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@@ -334,11 +349,13 @@ |
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cc = tif->tif_rawcc; |
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/* get each byte string */ |
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for (shft = 4*8; (shft -= 8) >= 0; ) { |
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- for (i = 0; i < npixels && cc > 0; ) |
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+ for (i = 0; i < npixels && cc > 0; ) { |
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if (*bp >= 128) { /* run */ |
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+ if( cc < 2 ) |
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+ break; |
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rc = *bp++ + (2-128); |
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b = (uint32)*bp++ << shft; |
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- cc -= 2; /* TODO: potential input buffer overrun when decoding corrupt or truncated data */ |
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+ cc -= 2; |
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while (rc-- && i < npixels) |
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tp[i++] |= b; |
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} else { /* non-run */ |
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@@ -346,6 +363,7 @@ |
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while (--cc && rc-- && i < npixels) |
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tp[i++] |= (uint32)*bp++ << shft; |
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} |
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+ } |
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if (i != npixels) { |
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#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
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TIFFErrorExt(tif->tif_clientdata, module, |
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@@ -407,6 +425,7 @@ |
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static int |
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LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
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{ |
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+ static const char module[] = "LogL16Encode"; |
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LogLuvState* sp = EncoderState(tif); |
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int shft; |
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tmsize_t i; |
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@@ -427,7 +446,11 @@ |
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tp = (int16*) bp; |
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else { |
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tp = (int16*) sp->tbuf; |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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(*sp->tfunc)(sp, bp, npixels); |
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} |
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/* compress each byte string */ |
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@@ -500,6 +523,7 @@ |
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static int |
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LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
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{ |
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+ static const char module[] = "LogLuvEncode24"; |
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LogLuvState* sp = EncoderState(tif); |
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tmsize_t i; |
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tmsize_t npixels; |
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@@ -515,7 +539,11 @@ |
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tp = (uint32*) bp; |
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else { |
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tp = (uint32*) sp->tbuf; |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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(*sp->tfunc)(sp, bp, npixels); |
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} |
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/* write out encoded pixels */ |
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@@ -547,6 +575,7 @@ |
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static int |
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LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
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{ |
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+ static const char module[] = "LogLuvEncode32"; |
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LogLuvState* sp = EncoderState(tif); |
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int shft; |
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tmsize_t i; |
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@@ -568,7 +597,11 @@ |
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tp = (uint32*) bp; |
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else { |
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tp = (uint32*) sp->tbuf; |
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- assert(sp->tbuflen >= npixels); |
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+ if(sp->tbuflen < npixels) { |
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+ TIFFErrorExt(tif->tif_clientdata, module, |
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+ "Translation buffer too short"); |
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+ return (0); |
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+ } |
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(*sp->tfunc)(sp, bp, npixels); |
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} |
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/* compress each byte string */
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