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btrfs: trim: Check the range passed into to prevent overflow

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Normally the range->len is set to default value (U64_MAX), but when it's
not default value, we should check if the range overflows.

And if it overflows, return -EINVAL before doing anything.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-05-28 16:21:54 +08:00 committed by David Sterba
parent d7cd4dd907
commit 07301df7d2
1 changed files with 11 additions and 3 deletions
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14
fs/btrfs/extent-tree.c
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@ -8966,6 +8966,7 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
struct btrfs_device *device;
struct list_head *devices;
u64 group_trimmed;
u64 range_end = U64_MAX;
u64 start;
u64 end;
u64 trimmed = 0;
@ -8975,16 +8976,23 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
int dev_ret = 0;
int ret = 0;
/*
* Check range overflow if range->len is set.
* The default range->len is U64_MAX.
*/
if (range->len != U64_MAX &&
check_add_overflow(range->start, range->len, &range_end))
return -EINVAL;
cache = btrfs_lookup_first_block_group(fs_info, range->start);
for (; cache; cache = next_block_group(cache)) {
if (cache->key.objectid >= (range->start + range->len)) {
if (cache->key.objectid >= range_end) {
btrfs_put_block_group(cache);
break;
}
start = max(range->start, cache->key.objectid);
end = min(range->start + range->len,
cache->key.objectid + cache->key.offset);
end = min(range_end, cache->key.objectid + cache->key.offset);
if (end - start >= range->minlen) {
if (!block_group_cache_done(cache)) {