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Do not overflow the stackbased "nt" struct when reading non-conforming

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PE files.
This commit is contained in:
Marcus Meissner 2005-10-31 21:03:05 +00:00 committed by Alexandre Julliard
parent 21883d794a
commit 4b811d9348
1 changed files with 3 additions and 3 deletions
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6
server/mapping.c
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@ -206,7 +206,7 @@ static int get_image_params( struct mapping *mapping )
IMAGE_SECTION_HEADER *sec = NULL;
struct fd *fd;
off_t pos;
int unix_fd, size;
int unix_fd, size, toread;
/* load the headers */
@ -225,8 +225,8 @@ static int get_image_params( struct mapping *mapping )
pos += sizeof(nt.FileHeader);
/* zero out Optional header in the case it's not present or partial */
memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
pos += nt.FileHeader.SizeOfOptionalHeader;
/* load the section headers */