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