From: Dave Jones <davej@redhat.com>
Date: Thu, 5 Apr 2012 21:25:06 +0000 (-0700)
Subject: fs/xattr.c: suppress page allocation failure warnings from sys_listxattr()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=703bf2d122c95412a30f72658c53ad6292867b0b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

fs/xattr.c: suppress page allocation failure warnings from sys_listxattr()

This size is user controllable, up to a maximum of XATTR_LIST_MAX (64k).
So it's trivial for someone to trigger a stream of order:4 page
allocation errors.

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dave Chinner <david@fromorbit.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/xattr.c b/fs/xattr.c
index d6dfd247bb2f..a14d842ccb21 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -496,7 +496,7 @@ listxattr(struct dentry *d, char __user *list, size_t size)
 	if (size) {
 		if (size > XATTR_LIST_MAX)
 			size = XATTR_LIST_MAX;
-		klist = kmalloc(size, GFP_KERNEL);
+		klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
 		if (!klist)
 			return -ENOMEM;
 	}