From: Gen Zhang blackgod016574@gmail.com
commit e2e0e09758a6f7597de0f9b819647addfb71b6bd upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- security/selinux/hooks.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)
--- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1048,15 +1048,24 @@ static int selinux_add_mnt_opt(const cha 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; }