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authorGen Zhang <blackgod016574@gmail.com>2019-06-12 15:28:21 +0200
committerPaul Moore <paul@paul-moore.com>2019-06-12 17:39:38 +0200
commite2e0e09758a6f7597de0f9b819647addfb71b6bd (patch)
tree49221a4e9f7f0c4dda4cd1502f42dce090695ef6 /security/selinux/hooks.c
parentselinux: log raw contexts as untrusted strings (diff)
downloadlinux-e2e0e09758a6f7597de0f9b819647addfb71b6bd.tar.xz
linux-e2e0e09758a6f7597de0f9b819647addfb71b6bd.zip
selinux: fix a missing-check bug in selinux_add_mnt_opt( )
In selinux_add_mnt_opt(), 'val' is allocated by kmemdup_nul(). It returns NULL when fails. So 'val' should be checked. And 'mnt_opts' should be freed when error. Signed-off-by: Gen Zhang <blackgod016574@gmail.com> Fixes: 757cbe597fe8 ("LSM: new method: ->sb_add_mnt_opt()") Cc: <stable@vger.kernel.org> [PM: fixed some indenting problems] Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to '')
-rw-r--r--security/selinux/hooks.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3ec702cf46ca..b7db84c97882 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1052,15 +1052,24 @@ static int selinux_add_mnt_opt(const char *option, const char *val, int len,
if (token == Opt_error)
return -EINVAL;
- if (token != Opt_seclabel)
+ if (token != Opt_seclabel) {
val = kmemdup_nul(val, len, GFP_KERNEL);
+ if (!val) {
+ rc = -ENOMEM;
+ goto free_opt;
+ }
+ }
rc = selinux_add_opt(token, val, mnt_opts);
if (unlikely(rc)) {
kfree(val);
- if (*mnt_opts) {
- selinux_free_mnt_opts(*mnt_opts);
- *mnt_opts = NULL;
- }
+ goto free_opt;
+ }
+ return rc;
+
+free_opt:
+ if (*mnt_opts) {
+ selinux_free_mnt_opts(*mnt_opts);
+ *mnt_opts = NULL;
}
return rc;
}