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authorDan Carpenter <error27@gmail.com>2010-03-15 11:21:13 +0300
committerJan Kara <jack@suse.cz>2010-04-08 15:35:20 +0200
commit69ecbbedac8e353bbd924fad16fed0c7c54e6382 (patch)
treef008c3ad0750585ea3d403718251922f215cb626 /fs/udf/balloc.c
parent0fdf86754f70e813845af4abaa805165ce57a0bb (diff)
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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>
Diffstat (limited to 'fs/udf/balloc.c')
-rw-r--r--fs/udf/balloc.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index 19626e2491c..9a9378b4eb5 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -125,9 +125,8 @@ static void udf_bitmap_free_blocks(struct super_block *sb,
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 @@ static void udf_table_free_blocks(struct super_block *sb,
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);