This patch try to fix potential memleak in error branch.
Signed-off-by: Bernard Zhao <bernard@xxxxxxxx>
Changes since V1:
*make it to be simpler to do the "(!s)" check before the "(!opts)" check.
Changes since v2:
*add *mnt_opts = NULL after kfree(opt) to avoid double free risk.
---
security/selinux/hooks.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 62d30c0a30c2..0d018f054dfb 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -983,18 +983,22 @@ static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
static int selinux_add_opt(int token, const char *s, void **mnt_opts)
{
struct selinux_mnt_opts *opts = *mnt_opts;
+ bool is_alloc_opts = false;
if (token == Opt_seclabel) /* eaten and completely ignored */
return 0;
+ if (!s)
+ return -ENOMEM;
+
if (!opts) {
opts = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
if (!opts)
return -ENOMEM;
*mnt_opts = opts;
+ is_alloc_opts = true;
}
- if (!s)
- return -ENOMEM;
+
switch (token) {
case Opt_context:
if (opts->context || opts->defcontext)
@@ -1019,6 +1023,10 @@ static int selinux_add_opt(int token, const char *s, void **mnt_opts)
}
return 0;
Einval:
+ if (is_alloc_opts) {
+ kfree(opts);
+ *mnt_opts = NULL;
+ }
pr_warn(SEL_MOUNT_FAIL_MSG);
return -EINVAL;
}
--
2.33.1
