On Sat, Nov 07, 2009 at 11:17:32PM +0100, Andi Kleen wrote:
> EXT4: Add missing brelse() in ext4_iget()
>
> One of the invalid error paths in ext4_iget() forgot to brelse() the inode
> buffer head. Fix that.
>
> Found during code review.
>
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Hi Andi, my apologies for the delay in responding; crazy travel
schedule. I've committed a slightly better fix which cleans up the
error handling for ext4_iget(), and drops the net number of lines in
fs/ext4/inode.c by 5, and shrinks the compiled object size as well:
31495 0 12 31507 7b13 /kbuild/ext4/fs/ext4/inode.o
31459 0 12 31471 7aef /kbuild/ext4/fs/ext4/inode.o
- Ted
ext4: plug a buffer_head leak in an error path of ext4_iget()
One of the invalid error paths in ext4_iget() forgot to brelse() the
inode buffer head. Fix it by adding a brelse() in the common error
return path, which also simplifies function.
Thanks to Andi Kleen <ak@xxxxxxxxxxxxxxx> reporting the problem.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/ext4/inode.c | 11 +++--------
1 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 2c8caa5..554c679 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4781,7 +4781,6 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
struct ext4_iloc iloc;
struct ext4_inode *raw_inode;
struct ext4_inode_info *ei;
- struct buffer_head *bh;
struct inode *inode;
long ret;
int block;
@@ -4793,11 +4792,11 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
return inode;
ei = EXT4_I(inode);
+ iloc.bh = 0;
ret = __ext4_get_inode_loc(inode, &iloc, 0);
if (ret < 0)
goto bad_inode;
- bh = iloc.bh;
raw_inode = ext4_raw_inode(&iloc);
inode->i_mode = le16_to_cpu(raw_inode->i_mode);
inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
@@ -4820,7 +4819,6 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
if (inode->i_mode == 0 ||
!(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) {
/* this inode is deleted */
- brelse(bh);
ret = -ESTALE;
goto bad_inode;
}
@@ -4852,7 +4850,6 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize);
if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize >
EXT4_INODE_SIZE(inode->i_sb)) {
- brelse(bh);
ret = -EIO;
goto bad_inode;
}
@@ -4905,10 +4902,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
/* Validate block references which are part of inode */
ret = ext4_check_inode_blockref(inode);
}
- if (ret) {
- brelse(bh);
+ if (ret)
goto bad_inode;
- }
if (S_ISREG(inode->i_mode)) {
inode->i_op = &ext4_file_inode_operations;
@@ -4936,7 +4931,6 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
init_special_inode(inode, inode->i_mode,
new_decode_dev(le32_to_cpu(raw_inode->i_block[1])));
} else {
- brelse(bh);
ret = -EIO;
ext4_error(inode->i_sb, __func__,
"bogus i_mode (%o) for inode=%lu",
@@ -4949,6 +4943,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
return inode;
bad_inode:
+ brelse(iloc.bh);
iget_failed(inode);
return ERR_PTR(ret);
}
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