4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chengguang Xu <cgxu519@xxxxxxxxxx>
[ Upstream commit 937441f3a3158d5510ca8cc78a82453f57a96365 ]
When parsing string option, in order to avoid memory leak we need to
carefully free it first in case of specifying same option several times.
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxx>
Reviewed-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/super.c | 2 ++
net/ceph/ceph_common.c | 7 +++++++
2 files changed, 9 insertions(+)
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -224,6 +224,7 @@ static int parse_fsopt_token(char *c, vo
return -ENOMEM;
break;
case Opt_mds_namespace:
+ kfree(fsopt->mds_namespace);
fsopt->mds_namespace = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
@@ -231,6 +232,7 @@ static int parse_fsopt_token(char *c, vo
return -ENOMEM;
break;
case Opt_fscache_uniq:
+ kfree(fsopt->fscache_uniq);
fsopt->fscache_uniq = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -418,11 +418,15 @@ ceph_parse_options(char *options, const
opt->flags |= CEPH_OPT_FSID;
break;
case Opt_name:
+ kfree(opt->name);
opt->name = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
break;
case Opt_secret:
+ ceph_crypto_key_destroy(opt->key);
+ kfree(opt->key);
+
opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
if (!opt->key) {
err = -ENOMEM;
@@ -433,6 +437,9 @@ ceph_parse_options(char *options, const
goto out;
break;
case Opt_key:
+ ceph_crypto_key_destroy(opt->key);
+ kfree(opt->key);
+
opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
if (!opt->key) {
err = -ENOMEM;
