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| author | Lukas Czerner <lczerner@redhat.com> | 2012-10-22 18:01:19 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-10-22 18:01:19 -0400 |
| commit | 5de35e8d5c02d271c20e18337e01bc20e6ef472e (patch) | |
| tree | 76650de85ba0c02a48de9daa1ba316b5108450f0 /fs | |
| parent | 79f1ba49569e5aec919b653c55b03274c2331701 (diff) | |
| download | linux-5de35e8d5c02d271c20e18337e01bc20e6ef472e.tar.bz2 | |
ext4: Avoid underflow in ext4_trim_fs()
Currently if len argument in ext4_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: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/mballoc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index eb1e385d8080..f05d08e13366 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4990,8 +4990,9 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range) minlen = EXT4_NUM_B2C(EXT4_SB(sb), range->minlen >> sb->s_blocksize_bits); - if (unlikely(minlen > EXT4_CLUSTERS_PER_GROUP(sb)) || - unlikely(start >= max_blks)) + if (minlen > EXT4_CLUSTERS_PER_GROUP(sb) || + start >= max_blks || + range->len < sb->s_blocksize) return -EINVAL; if (end >= max_blks) end = max_blks - 1; |