From eecb0712f4c3a5b449f70c57988260a667ddbdef Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Sun, 6 Feb 2022 13:08:38 +0100 Subject: [PATCH] TIFFFetchStripThing(): avoid calling memcpy() with a null source pointer and size of zero (fixes #362) Upstream-Status: Backport CVE: CVE-2022-0561 --- libtiff/tif_dirread.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c index 23194ced..50ebf8ac 100644 --- a/libtiff/tif_dirread.c +++ b/libtiff/tif_dirread.c @@ -5777,8 +5777,9 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32_t nstrips, uint64_t** l _TIFFfree(data); return(0); } - _TIFFmemcpy(resizeddata,data, (uint32_t)dir->tdir_count * sizeof(uint64_t)); - _TIFFmemset(resizeddata+(uint32_t)dir->tdir_count, 0, (nstrips - (uint32_t)dir->tdir_count) * sizeof(uint64_t)); + if( dir->tdir_count ) + _TIFFmemcpy(resizeddata,data, (uint32_t)dir->tdir_count * sizeof(uint64_t)); + _TIFFmemset(resizeddata+(uint32_t)dir->tdir_count, 0, (nstrips - (uint32_t)dir->tdir_count) * sizeof(uint64_t)); _TIFFfree(data); data=resizeddata; } -- GitLab