This is a note to let you know that I've just added the patch titled
affs: fix a memory leak in affs_remount
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
affs-fix-a-memory-leak-in-affs_remount.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 450c3d4166837c496ebce03650c08800991f2150 Mon Sep 17 00:00:00 2001
From: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
Date: Wed, 2 Oct 2019 16:52:37 -0500
Subject: affs: fix a memory leak in affs_remount
From: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
commit 450c3d4166837c496ebce03650c08800991f2150 upstream.
In affs_remount if data is provided it is duplicated into new_opts. The
allocated memory for new_opts is only released if parse_options fails.
There's a bit of history behind new_options, originally there was
save/replace options on the VFS layer so the 'data' passed must not
change (thus strdup), this got cleaned up in later patches. But not
completely.
There's no reason to do the strdup in cases where the filesystem does
not need to reuse the 'data' again, because strsep would modify it
directly.
Fixes: c8f33d0bec99 ("affs: kstrdup() memory handling")
Signed-off-by: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/affs/super.c | 6 ------
1 file changed, 6 deletions(-)
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -561,14 +561,9 @@ affs_remount(struct super_block *sb, int
int root_block;
unsigned long mount_flags;
int res = 0;
- char *new_opts;
char volume[32];
char *prefix = NULL;
- new_opts = kstrdup(data, GFP_KERNEL);
- if (data && !new_opts)
- return -ENOMEM;
-
pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
sync_filesystem(sb);
@@ -579,7 +574,6 @@ affs_remount(struct super_block *sb, int
&blocksize, &prefix, volume,
&mount_flags)) {
kfree(prefix);
- kfree(new_opts);
return -EINVAL;
}
Patches currently in stable-queue which might be from navid.emamdoost@xxxxxxxxx are
queue-5.4/affs-fix-a-memory-leak-in-affs_remount.patch
