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$NetBSD: patch-libtiff_tif_luv.c,v 1.1 2016/03/22 21:50:13 tez Exp $
Fix for CVE-2015-8781, CVE-2015-8782, CVE-2015-8783 from:
https://github.com/vadz/libtiff/commit/aaab5c3c9d2a2c6984f23ccbc79702610439bc65.diff
--- libtiff/tif_luv.c.orig
+++ libtiff/tif_luv.c
@@ -202,7 +202,11 @@ LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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 @@ LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
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,
@@ -413,6 +431,7 @@ LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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;
@@ -433,7 +452,11 @@ LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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 */
@@ -506,6 +529,7 @@ LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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;
@@ -521,7 +545,11 @@ LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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 */
@@ -553,6 +581,7 @@ LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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;
@@ -574,7 +603,11 @@ LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
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 */
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