memzap

commit f4e8603d28528fe54269d299aefcdc0bfa932c61
parent 5f721ec36e692243453e5d728aeb8f0710bfcfc2
Author: sin <sin@2f30.org>
Date:   Sun,  3 Mar 2013 16:07:04 +0000

mdiff: Check if the user requested to read an out of bounds region

Diffstat:
M
mdiff.c
 | 
3
+++

1 file changed, 3 insertions(+), 0 deletions(-)
diff --git a/mdiff.c b/mdiff.c
@@ -101,6 +101,9 @@ mdiff_read_diff(int fd, struct mdiff_hdr *hdr, uint32_t region)
 	if (fd < 0 || !hdr)
 		return NULL;
 
+	if (region >= hdr->nregions)
+		return NULL;
+
 	offset = sizeof(*hdr);
 	ret = lseek(fd, offset, SEEK_SET);
 	if (ret < 0)