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authorLukas Czerner <lczerner@redhat.com>2012-10-11 12:28:38 +0200
committerJan Kara <jack@suse.cz>2012-11-19 21:36:12 +0100
commitae49eeec785025373e28dc24c8351c6bba688d99 (patch)
tree26d391bf3656e1db4e8e0d97017185c7cc968bff
parent7af11686933726e99af22901d622f9e161404e6b (diff)
downloadlinux-ae49eeec785025373e28dc24c8351c6bba688d99.tar.bz2
ext3: Avoid underflow of in ext3_trim_fs()
Currently if len argument in ext3_trim_fs() is smaller than one block, the 'end' variable underflow. Avoid that by returning EINVAL if len is smaller than file system block. Also remove useless unlikely(). Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/ext3/balloc.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index 7320a66e958f..22548f56197b 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -2101,8 +2101,9 @@ int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range)
end = start + (range->len >> sb->s_blocksize_bits) - 1;
minlen = range->minlen >> sb->s_blocksize_bits;
- if (unlikely(minlen > EXT3_BLOCKS_PER_GROUP(sb)) ||
- unlikely(start >= max_blks))
+ if (minlen > EXT3_BLOCKS_PER_GROUP(sb) ||
+ start >= max_blks ||
+ range->len < sb->s_blocksize)
return -EINVAL;
if (end >= max_blks)
end = max_blks - 1;