From: Ari Savolainen <ari.m.savolainen@gmail.com>
Date: Sat, 6 Aug 2011 16:43:07 +0000 (+0300)
Subject: Fix POSIX ACL permission check
X-Git-Tag: firefly_0821_release~3680^2~4699
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=206b1d09a56dcd2db1052245c4131879c410eaf8;p=firefly-linux-kernel-4.4.55.git

Fix POSIX ACL permission check

After commit 3567866bf261: "RCUify freeing acls, let check_acl() go ahead in
RCU mode if acl is cached" posix_acl_permission is being called with an
unsupported flag and the permission check fails. This patch fixes the issue.

Signed-off-by: Ari Savolainen <ari.m.savolainen@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/namei.c b/fs/namei.c
index 4a98bf154d88..fc13609a354a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -186,7 +186,7 @@ static int check_acl(struct inode *inode, int mask)
 		/* no ->get_acl() calls in RCU mode... */
 		if (acl == ACL_NOT_CACHED)
 			return -ECHILD;
-	        return posix_acl_permission(inode, acl, mask);
+	        return posix_acl_permission(inode, acl, mask & ~MAY_NOT_BLOCK);
 	}
 
 	acl = get_cached_acl(inode, ACL_TYPE_ACCESS);