Blame SOURCES/0021-CVE-2022-0561-TIFFFetchStripThing-avoid-calling-memc.patch
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From b94f6754796d32e204b874b3660a125973815933 Mon Sep 17 00:00:00 2001
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From: Even Rouault <even.rouault@spatialys.com>
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Date: Sun, 6 Feb 2022 13:08:38 +0100
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Subject: [PATCH] (CVE-2022-0561) TIFFFetchStripThing(): avoid calling memcpy()
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with a null source pointer and size of zero (fixes #362)
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(cherry picked from commit eecb0712f4c3a5b449f70c57988260a667ddbdef)
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---
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libtiff/tif_dirread.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
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index 80aaf8d1..1e6f1c2f 100644
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--- a/libtiff/tif_dirread.c
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+++ b/libtiff/tif_dirread.c
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@@ -5633,8 +5633,9 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32 nstrips, uint64** lpp)
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_TIFFfree(data);
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return(0);
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}
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- _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
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- _TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
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+ if( dir->tdir_count )
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+ _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
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+ _TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
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_TIFFfree(data);
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data=resizeddata;
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}
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