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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>
This commit is contained in:
Lukas Czerner 2012-10-11 12:28:38 +02:00 committed by Jan Kara
parent 7af1168693
commit ae49eeec78
1 changed files with 3 additions and 2 deletions
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5
fs/ext3/balloc.c
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@ -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;