From 9c95a278ba7ca3ccc111c165cc74cb23c744fc85 Mon Sep 17 00:00:00 2001 From: Patrick Steinhardt Date: Wed, 11 Dec 2019 12:44:08 +0100 Subject: [PATCH] apparmor: fix bind mounts aborting with -ENOMEM With commit df323337e507 ("apparmor: Use a memory pool instead per-CPU caches, 2019-05-03"), AppArmor code was converted to use memory pools. In that conversion, a bug snuck into the code that polices bind mounts that causes all bind mounts to fail with -ENOMEM, as we erroneously error out if `aa_get_buffer` returns a pointer instead of erroring out when it does _not_ return a valid pointer. Fix the issue by correctly checking for valid pointers returned by `aa_get_buffer` to fix bind mounts with AppArmor. Fixes: df323337e507 ("apparmor: Use a memory pool instead per-CPU caches") Signed-off-by: Patrick Steinhardt Signed-off-by: John Johansen --- security/apparmor/mount.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c index 4ed6688f9d40..e0828ee7a345 100644 --- a/security/apparmor/mount.c +++ b/security/apparmor/mount.c @@ -442,7 +442,7 @@ int aa_bind_mount(struct aa_label *label, const struct path *path, buffer = aa_get_buffer(false); old_buffer = aa_get_buffer(false); error = -ENOMEM; - if (!buffer || old_buffer) + if (!buffer || !old_buffer) goto out; error = fn_for_each_confined(label, profile,