From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Tue, 22 Jul 2008 20:05:19 +0000 (+0000)
Subject: proc: fix /proc/*/pagemap some more
X-Git-Tag: v2.6.26.1~40
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81952a2391da91d8ff35c96b31f051f5242dfc1b;p=thirdparty%2Fkernel%2Fstable.git

proc: fix /proc/*/pagemap some more

commit ee1e6ab6056a8b9c19377257002da98b83819531 upstream

struct pagemap_walk was placed on stack, some hooks are initialized, the
rest (->pgd_entry, ->pud_entry, ->pte_entry) are valid but junk.

Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Vegard Nossum" <vegard.nossum@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c492449f3b450..1eaa39a650c39 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -636,7 +636,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
 	struct pagemapread pm;
 	int pagecount;
 	int ret = -ESRCH;
-	struct mm_walk pagemap_walk;
+	struct mm_walk pagemap_walk = {};
 	unsigned long src;
 	unsigned long svpfn;
 	unsigned long start_vaddr;