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ext4: clean up error handling in the MMP support 

There is memory leak as both caller function kmmpd() and callee
read_mmp_block() not releasing bh_check  (i.e buffer_head).
Given patch fixes this problem.

[ Additional changes suggested by Andreas Dilger -- TYT ]

Signed-off-by: Jadhav Vikram <vikramjadhavpucsd2007@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
vikram.jadhav07 2016-03-13 17:56:52 -04:00 committed by Theodore Ts'o
parent 490c1b444c
commit 0304688676
1 changed files with 17 additions and 17 deletions
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34
fs/ext4/mmp.c
View File

@ -91,21 +91,22 @@ static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
submit_bh(READ_SYNC | REQ_META | REQ_PRIO, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
brelse(*bh);
*bh = NULL;
ret = -EIO;
goto warn_exit;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC)
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC) {
ret = -EFSCORRUPTED;
else if (!ext4_mmp_csum_verify(sb, mmp))
goto warn_exit;
}
if (!ext4_mmp_csum_verify(sb, mmp)) {
ret = -EFSBADCRC;
else
return 0;
goto warn_exit;
}
return 0;
warn_exit:
brelse(*bh);
*bh = NULL;
ext4_warning(sb, "Error %d while reading MMP block %llu",
ret, mmp_block);
return ret;
@ -181,15 +182,13 @@ static int kmmpd(void *data)
EXT4_FEATURE_INCOMPAT_MMP)) {
ext4_warning(sb, "kmmpd being stopped since MMP feature"
" has been disabled.");
EXT4_SB(sb)->s_mmp_tsk = NULL;
goto failed;
goto exit_thread;
}
if (sb->s_flags & MS_RDONLY) {
ext4_warning(sb, "kmmpd being stopped since filesystem "
"has been remounted as readonly.");
EXT4_SB(sb)->s_mmp_tsk = NULL;
goto failed;
goto exit_thread;
}
diff = jiffies - last_update_time;
@ -211,9 +210,7 @@ static int kmmpd(void *data)
if (retval) {
ext4_error(sb, "error reading MMP data: %d",
retval);
EXT4_SB(sb)->s_mmp_tsk = NULL;
goto failed;
goto exit_thread;
}
mmp_check = (struct mmp_struct *)(bh_check->b_data);
@ -225,7 +222,9 @@ static int kmmpd(void *data)
"The filesystem seems to have been"
" multiply mounted.");
ext4_error(sb, "abort");
goto failed;
put_bh(bh_check);
retval = -EBUSY;
goto exit_thread;
}
put_bh(bh_check);
}
@ -248,7 +247,8 @@ static int kmmpd(void *data)
retval = write_mmp_block(sb, bh);
failed:
exit_thread:
EXT4_SB(sb)->s_mmp_tsk = NULL;
kfree(data);
brelse(bh);
return retval;