linux-kernel - [tip:ras/core] x86/mce: Avoid using object after free in genpool

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Date:	Wed, 13 Apr 2016 04:35:03 -0700
From:	tip-bot for Tony Luck <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-edac@...r.kernel.org, stable@...r.kernel.org,
	tony.luck@...el.com, gong.chen@...ux.intel.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...or.com,
	torvalds@...ux-foundation.org, bp@...e.de, peterz@...radead.org
Subject: [tip:ras/core] x86/mce: Avoid using object after free in genpool

Commit-ID:  a3125494cff084b098c80bb36fbe2061ffed9d52
Gitweb:     http://git.kernel.org/tip/a3125494cff084b098c80bb36fbe2061ffed9d52
Author:     Tony Luck <tony.luck@...el.com>
AuthorDate: Wed, 6 Apr 2016 10:05:16 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Apr 2016 10:54:00 +0200

x86/mce: Avoid using object after free in genpool

When we loop over all queued machine check error records to pass them
to the registered notifiers we use llist_for_each_entry(). But the loop
calls gen_pool_free() for the entry in the body of the loop - and then
the iterator looks at node->next after the free.

Use llist_for_each_entry_safe() instead.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: <stable@...r.kernel.org>
Cc: Gong Chen <gong.chen@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/0205920@agluck-desk.sc.intel.com
Link: http://lkml.kernel.org/r/1459929916-12852-4-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce-genpool.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce-genpool.c b/arch/x86/kernel/cpu/mcheck/mce-genpool.c
index 0a85010..2658e2a 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-genpool.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-genpool.c
@@ -29,7 +29,7 @@ static char gen_pool_buf[MCE_POOLSZ];
 void mce_gen_pool_process(void)
 {
 	struct llist_node *head;
-	struct mce_evt_llist *node;
+	struct mce_evt_llist *node, *tmp;
 	struct mce *mce;
 
 	head = llist_del_all(&mce_event_llist);
@@ -37,7 +37,7 @@ void mce_gen_pool_process(void)
 		return;
 
 	head = llist_reverse_order(head);
-	llist_for_each_entry(node, head, llnode) {
+	llist_for_each_entry_safe(node, tmp, head, llnode) {
 		mce = &node->mce;
 		atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
 		gen_pool_free(mce_evt_pool, (unsigned long)node, sizeof(*node));