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| author | vikram.jadhav07 <vikramjadhavpucsd2007@gmail.com> | 2016-03-13 17:56:52 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-03-13 17:56:52 -0400 |
| commit | 0304688676bdfc8159e165313d71da19c118ba27 (patch) | |
| tree | 029ff2743a674d77d37e2c27d1c651b72fb4500e /fs/ext4 | |
| parent | 490c1b444ce653d0784a9a5fa4d11287029feeb9 (diff) | |
| download | linux-0304688676bdfc8159e165313d71da19c118ba27.tar.gz linux-0304688676bdfc8159e165313d71da19c118ba27.tar.bz2 linux-0304688676bdfc8159e165313d71da19c118ba27.zip | |
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>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mmp.c | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c index 0a512aa81bf7..24445275d330 100644 --- a/fs/ext4/mmp.c +++ b/fs/ext4/mmp.c @@ -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; |