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f2fs: avoid returning uninitialized value to userspace from f2fs_trim_fs()

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If user specifies too low end sector for trimming, f2fs_trim_fs() will
use uninitialized value as a number of trimmed blocks and returns it to
userspace. Initialize number of trimmed blocks early to avoid the
problem.

Coverity-id: 1248809
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jan Kara 2014-10-21 14:07:33 +02:00 committed by Jaegeuk Kim
parent d64948a4df
commit 9bd27ae4aa
1 changed files with 1 additions and 1 deletions
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2
fs/f2fs/segment.c
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@ -1032,6 +1032,7 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
range->len < sbi->blocksize)
return -EINVAL;
cpc.trimmed = 0;
if (end <= MAIN_BLKADDR(sbi))
goto out;
@ -1043,7 +1044,6 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
cpc.trim_start = start_segno;
cpc.trim_end = end_segno;
cpc.trim_minlen = range->minlen >> sbi->log_blocksize;
cpc.trimmed = 0;
/* do checkpoint to issue discard commands safely */
write_checkpoint(sbi, &cpc);