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affs: fix a memory leak in affs_remount

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[ Upstream commit 450c3d4166837c496ebce03650c08800991f2150 ]

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: c8f33d0bec ("affs: kstrdup() memory handling")
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Navid Emamdoost 2019-10-02 16:52:37 -05:00 committed by Greg Kroah-Hartman
parent f9e9fc4574
commit c96c543514
1 changed files with 0 additions and 6 deletions
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6
fs/affs/super.c
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@ -561,14 +561,9 @@ affs_remount(struct super_block *sb, int *flags, char *data)
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 *flags, char *data)
&blocksize, &prefix, volume,
&mount_flags)) {
kfree(prefix);
kfree(new_opts);
return -EINVAL;
}