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Date: Fri, 3 Sep 2021 16:51:18 -0500
From: Dave Kleikamp <dave.kleikamp@...cle.com>
To: Dongliang Mu <mudongliangabcd@...il.com>
Cc: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] JFS: fix memleak in jfs_mount
Thanks for waiting. I have just a couple comments, but this looks good.
I appreciate the clean up.
On 8/18/21 5:25 AM, Dongliang Mu wrote:
> In jfs_mount, when diMount(ipaimap2) fails, it goes to errout35. However,
> the following code does not free ipaimap2 allocated by diReadSpecial.
>
> Fix this by refactoring the error handling code of jfs_mount. To be
> specific, modify the lable name and free ipaimap2 when the above error
> ocurrs.
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
> fs/jfs/jfs_mount.c | 53 +++++++++++++++++++---------------------------
> 1 file changed, 22 insertions(+), 31 deletions(-)
>
> diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c
> index 5d7d7170c03c..638a4ecc4069 100644
> --- a/fs/jfs/jfs_mount.c
> +++ b/fs/jfs/jfs_mount.c
> @@ -81,14 +81,14 @@ int jfs_mount(struct super_block *sb)
> * (initialize mount inode from the superblock)
> */
> if ((rc = chkSuper(sb))) {
> - goto errout20;
> + return rc;
This may have been intentional, but it isn't mentioned in the patch header.
If chkSuper fails, we will no longer call
jfs_err("Mount JFS Failure: %d", rc);
I don't necessarily see this as a bad thing. In many cases, chkSuper
prints a more helpful message. In the case where it silently fails, it's
not even recognizing the superblock as a supported version of JFS and
this message isn't particularly helpful. In fact this jfs_err()
statement might be best deleted in its entirety.
> }
>
> ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
> if (ipaimap == NULL) {
> jfs_err("jfs_mount: Failed to read AGGREGATE_I");
> rc = -EIO;
> - goto errout20;
> + goto out;
> }
> sbi->ipaimap = ipaimap;
>
> @@ -99,7 +99,7 @@ int jfs_mount(struct super_block *sb)
> */
> if ((rc = diMount(ipaimap))) {
> jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
> - goto errout21;
> + goto err_ipaimap;
> }
>
> /*
> @@ -108,7 +108,7 @@ int jfs_mount(struct super_block *sb)
> ipbmap = diReadSpecial(sb, BMAP_I, 0);
> if (ipbmap == NULL) {
> rc = -EIO;
> - goto errout22;
> + goto err_umount_ipaimap;
> }
>
> jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);
> @@ -120,7 +120,7 @@ int jfs_mount(struct super_block *sb)
> */
> if ((rc = dbMount(ipbmap))) {
> jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
> - goto errout22;
> + goto err_ipbmap;
> }
>
> /*
> @@ -139,7 +139,7 @@ int jfs_mount(struct super_block *sb)
> if (!ipaimap2) {
> jfs_err("jfs_mount: Failed to read AGGREGATE_I");
> rc = -EIO;
> - goto errout35;
> + goto err_umount_ipbmap;
> }
> sbi->ipaimap2 = ipaimap2;
>
> @@ -151,7 +151,7 @@ int jfs_mount(struct super_block *sb)
> if ((rc = diMount(ipaimap2))) {
> jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
> rc);
> - goto errout35;
> + goto err_ipaimap2;
> }
> } else
> /* Secondary aggregate inode table is not valid */
> @@ -168,7 +168,7 @@ int jfs_mount(struct super_block *sb)
> jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
> /* open fileset secondary inode allocation map */
> rc = -EIO;
> - goto errout40;
> + goto err_umount_ipaimap2;
> }
> jfs_info("jfs_mount: ipimap:0x%p", ipimap);
>
> @@ -178,41 +178,32 @@ int jfs_mount(struct super_block *sb)
> /* initialize fileset inode allocation map */
> if ((rc = diMount(ipimap))) {
> jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
> - goto errout41;
> + goto err_ipimap;
> }
>
> - goto out;
> + return rc;
>
> /*
> * unwind on error
> */
> - errout41: /* close fileset inode allocation map inode */
> +err_ipimap:
> + /* close fileset inode allocation map inode */
> diFreeSpecial(ipimap);
> -
> - errout40: /* fileset closed */
> -
> +err_umount_ipaimap2:
> /* close secondary aggregate inode allocation map */
> - if (ipaimap2) {
> - diUnmount(ipaimap2, 1);
> - diFreeSpecial(ipaimap2);
> - }
> -
> - errout35:
> -
> - /* close aggregate block allocation map */
> + if (ipaimap2) diUnmount(ipaimap2, 1);
Coding style: this should be split between two lines:
if (ipaimap2)
diUnmount(ipaimap2, 1);
> +err_ipaimap2:
> + /* close aggregate inodes */
> + if (ipaimap2) diFreeSpecial(ipaimap2);
Same here.
> +err_umount_ipbmap: /* close aggregate block allocation map */
> dbUnmount(ipbmap, 1);
> +err_ipbmap: /* close aggregate inodes */
> diFreeSpecial(ipbmap);
> -
> - errout22: /* close aggregate inode allocation map */
> -
> +err_umount_ipaimap: /* close aggregate inode allocation map */
> diUnmount(ipaimap, 1);
> -
> - errout21: /* close aggregate inodes */
> +err_ipaimap: /* close aggregate inodes */
> diFreeSpecial(ipaimap);
> - errout20: /* aggregate closed */
> -
> - out:
> -
> +out:
> if (rc)
> jfs_err("Mount JFS Failure: %d", rc);
>
>
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