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Use smarter overflow tests

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Suggested by: bde
This commit is contained in:
Andrey A. Chernov 2001-08-15 20:10:38 +00:00
parent ca0bdcdd29
commit 74b2772824
1 changed files with 6 additions and 3 deletions
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9
lib/libc/stdio/fseek.c
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@ -45,10 +45,11 @@ static const char rcsid[] =
#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "un-namespace.h"
#include "local.h"
#include "libc_private.h"
@ -132,7 +133,8 @@ _fseeko(fp, offset, whence)
} else if (fp->_flags & __SWR && fp->_p != NULL)
curoff += fp->_p - fp->_bf._base;
if (offset > 0 && offset + (off_t)curoff < 0) {
/* curoff always >= 0 */
if (offset > 0 && curoff > OFF_MAX - offset) {
errno = EOVERFLOW;
return (EOF);
}
@ -194,7 +196,8 @@ _fseeko(fp, offset, whence)
else {
if (_fstat(fp->_file, &st))
goto dumb;
if (offset > 0 && st.st_size + offset < 0) {
/* st.st_size always >= 0 */
if (offset > 0 && st.st_size > OFF_MAX - offset) {
errno = EOVERFLOW;
return (EOF);
}