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authorLukas Czerner <lczerner@redhat.com>2012-10-22 18:01:19 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-10-22 18:01:19 -0400
commit5de35e8d5c02d271c20e18337e01bc20e6ef472e (patch)
tree76650de85ba0c02a48de9daa1ba316b5108450f0 /fs
parent79f1ba49569e5aec919b653c55b03274c2331701 (diff)
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.c5
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)
4990 minlen = EXT4_NUM_B2C(EXT4_SB(sb), 4990 minlen = EXT4_NUM_B2C(EXT4_SB(sb),
4991 range->minlen >> sb->s_blocksize_bits); 4991 range->minlen >> sb->s_blocksize_bits);
4992 4992
4993 if (unlikely(minlen > EXT4_CLUSTERS_PER_GROUP(sb)) || 4993 if (minlen > EXT4_CLUSTERS_PER_GROUP(sb) ||
4994 unlikely(start >= max_blks)) 4994 start >= max_blks ||
4995 range->len < sb->s_blocksize)
4995 return -EINVAL; 4996 return -EINVAL;
4996 if (end >= max_blks) 4997 if (end >= max_blks)
4997 end = max_blks - 1; 4998 end = max_blks - 1;