From 6bdc0eab880100b9ebdd022df2a38082686cde9b Mon Sep 17 00:00:00 2001 From: Navid Emamdoost Date: Wed, 2 Oct 2019 16:52:37 -0500 Subject: [PATCH] affs: fix a memory leak in affs_remount 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 [ update changelog ] Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/affs/super.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/fs/affs/super.c b/fs/affs/super.c index cc463ae47c12..3812f7bc3a7f 100644 --- a/fs/affs/super.c +++ b/fs/affs/super.c @@ -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; }