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selinux: fix double free in selinux_parse_opts_str()

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This patch is based on a discussion generated by an earlier patch
from Tetsuo Handa:

* https://marc.info/?t=149035659300001&r=1&w=2

The double free problem involves the mnt_opts field of the
security_mnt_opts struct, selinux_parse_opts_str() frees the memory
on error, but doesn't set the field to NULL so if the caller later
attempts to call security_free_mnt_opts() we trigger the problem.

In order to play it safe we change selinux_parse_opts_str() to call
security_free_mnt_opts() on error instead of free'ing the memory
directly.  This should ensure that everything is handled correctly,
regardless of what the caller may do.

Fixes: e0007529893c1c06 ("LSM/SELinux: Interfaces to allow FS to control mount options")
Cc: stable@vger.kernel.org
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Paul Moore 2017-06-07 16:48:19 -04:00 committed by James Morris
parent 63f700aab4
commit 023f108dcc
1 changed files with 2 additions and 3 deletions
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5
security/selinux/hooks.c
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@ -1106,10 +1106,8 @@ static int selinux_parse_opts_str(char *options,
opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int),
GFP_KERNEL);
if (!opts->mnt_opts_flags) {
kfree(opts->mnt_opts);
if (!opts->mnt_opts_flags)
goto out_err;
}
if (fscontext) {
opts->mnt_opts[num_mnt_opts] = fscontext;
@ -1132,6 +1130,7 @@ static int selinux_parse_opts_str(char *options,
return 0;
out_err:
security_free_mnt_opts(opts);
kfree(context);
kfree(defcontext);
kfree(fscontext);