diff options
Diffstat (limited to 'main/tiff/CVE-2018-8905.patch')
| -rw-r--r-- | main/tiff/CVE-2018-8905.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/main/tiff/CVE-2018-8905.patch b/main/tiff/CVE-2018-8905.patch new file mode 100644 index 0000000000..f951092c1f --- /dev/null +++ b/main/tiff/CVE-2018-8905.patch @@ -0,0 +1,51 @@ +From 58a898cb4459055bb488ca815c23b880c242a27d Mon Sep 17 00:00:00 2001 +From: Even Rouault <even.rouault@spatialys.com> +Date: Sat, 12 May 2018 15:32:31 +0200 +Subject: [PATCH] LZWDecodeCompat(): fix potential index-out-of-bounds write. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2780 / CVE-2018-8905 + +The fix consists in using the similar code LZWDecode() to validate we +don't write outside of the output buffer. +--- + libtiff/tif_lzw.c | 18 ++++++++++++------ + 1 file changed, 12 insertions(+), 6 deletions(-) + +diff --git a/libtiff/tif_lzw.c b/libtiff/tif_lzw.c +index 4ccb443..94d85e3 100644 +--- a/libtiff/tif_lzw.c ++++ b/libtiff/tif_lzw.c +@@ -602,6 +602,7 @@ LZWDecodeCompat(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s) + char *tp; + unsigned char *bp; + int code, nbits; ++ int len; + long nextbits, nextdata, nbitsmask; + code_t *codep, *free_entp, *maxcodep, *oldcodep; + +@@ -753,13 +754,18 @@ LZWDecodeCompat(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s) + } while (--occ); + break; + } +- assert(occ >= codep->length); +- op += codep->length; +- occ -= codep->length; +- tp = op; ++ len = codep->length; ++ tp = op + len; + do { +- *--tp = codep->value; +- } while( (codep = codep->next) != NULL ); ++ int t; ++ --tp; ++ t = codep->value; ++ codep = codep->next; ++ *tp = (char)t; ++ } while (codep && tp > op); ++ assert(occ >= len); ++ op += len; ++ occ -= len; + } else { + *op++ = (char)code; + occ--; +-- +libgit2 0.27.0 + |