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| author | Gen Zhang <blackgod016574@gmail.com> | 2019-06-12 21:28:21 +0800 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2019-06-12 11:39:38 -0400 |
| commit | e2e0e09758a6f7597de0f9b819647addfb71b6bd (patch) | |
| tree | 49221a4e9f7f0c4dda4cd1502f42dce090695ef6 /security | |
| parent | aff7ed4851680d0d28ad9f52cd2f99213e1371b2 (diff) | |
| download | linux-e2e0e09758a6f7597de0f9b819647addfb71b6bd.tar.gz linux-e2e0e09758a6f7597de0f9b819647addfb71b6bd.tar.bz2 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 'security')
| -rw-r--r-- | security/selinux/hooks.c | 19 |
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; } |