diff options
Diffstat (limited to 'libtiff-CVE-2016-10266.patch')
| -rw-r--r-- | libtiff-CVE-2016-10266.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libtiff-CVE-2016-10266.patch b/libtiff-CVE-2016-10266.patch new file mode 100644 index 000000000000..1a6558be19ff --- /dev/null +++ b/libtiff-CVE-2016-10266.patch @@ -0,0 +1,43 @@ +From 438274f938e046d33cb0e1230b41da32ffe223e1 Mon Sep 17 00:00:00 2001 +From: erouault <erouault> +Date: Fri, 2 Dec 2016 21:56:56 +0000 +Subject: [PATCH] * libtiff/tif_read.c, libtiff/tiffiop.h: fix uint32 overflow + in TIFFReadEncodedStrip() that caused an integer division by zero. Reported + by Agostino Sarubbo. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2596 + +--- + libtiff/tif_read.c | 2 +- + libtiff/tiffiop.h | 4 ++++ + 2 files changed, 5 insertions(+), 1 deletion(-) + +diff --git a/libtiff/tif_read.c b/libtiff/tif_read.c +index c26c55f..52bbf50 100644 +--- a/libtiff/tif_read.c ++++ b/libtiff/tif_read.c +@@ -346,7 +346,7 @@ TIFFReadEncodedStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size) + rowsperstrip=td->td_rowsperstrip; + if (rowsperstrip>td->td_imagelength) + rowsperstrip=td->td_imagelength; +- stripsperplane=((td->td_imagelength+rowsperstrip-1)/rowsperstrip); ++ stripsperplane= TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip); + stripinplane=(strip%stripsperplane); + plane=(uint16)(strip/stripsperplane); + rows=td->td_imagelength-stripinplane*rowsperstrip; +diff --git a/libtiff/tiffiop.h b/libtiff/tiffiop.h +index ffbb647..cb59460 100644 +--- a/libtiff/tiffiop.h ++++ b/libtiff/tiffiop.h +@@ -250,6 +250,10 @@ struct tiff { + #define TIFFhowmany_32(x, y) (((uint32)x < (0xffffffff - (uint32)(y-1))) ? \ + ((((uint32)(x))+(((uint32)(y))-1))/((uint32)(y))) : \ + 0U) ++/* Variant of TIFFhowmany_32() that doesn't return 0 if x close to MAXUINT. */ ++/* Caution: TIFFhowmany_32_maxuint_compat(x,y)*y might overflow */ ++#define TIFFhowmany_32_maxuint_compat(x, y) \ ++ (((uint32)(x) / (uint32)(y)) + ((((uint32)(x) % (uint32)(y)) != 0) ? 1 : 0)) + #define TIFFhowmany8_32(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3) + #define TIFFroundup_32(x, y) (TIFFhowmany_32(x,y)*(y)) + #define TIFFhowmany_64(x, y) ((((uint64)(x))+(((uint64)(y))-1))/((uint64)(y))) +-- +2.7.4 + |