udf: potential integer overflow
bloc->logicalBlockNum is unsigned so it's never less than zero.
When I saw that, it made me worry that "bloc->logicalBlockNum + count"
could overflow. That's why I changed the check for less than zero
to an overflow check. (The test works because "count" is also
unsigned.)
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index 19626e2..9a9378b 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -125,9 +125,8 @@
mutex_lock(&sbi->s_alloc_mutex);
partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
- if (bloc->logicalBlockNum < 0 ||
- (bloc->logicalBlockNum + count) >
- partmap->s_partition_len) {
+ if (bloc->logicalBlockNum + count < count ||
+ (bloc->logicalBlockNum + count) > partmap->s_partition_len) {
udf_debug("%d < %d || %d + %d > %d\n",
bloc->logicalBlockNum, 0, bloc->logicalBlockNum,
count, partmap->s_partition_len);
@@ -393,9 +392,8 @@
mutex_lock(&sbi->s_alloc_mutex);
partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
- if (bloc->logicalBlockNum < 0 ||
- (bloc->logicalBlockNum + count) >
- partmap->s_partition_len) {
+ if (bloc->logicalBlockNum + count < count ||
+ (bloc->logicalBlockNum + count) > partmap->s_partition_len) {
udf_debug("%d < %d || %d + %d > %d\n",
bloc->logicalBlockNum, 0, bloc->logicalBlockNum, count,
partmap->s_partition_len);