linux-kernel - [PATCH] Add flag __GFP_NOFAIL when allocating block

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Message-Id: <1159494812.20092.727.camel@ymzhang-perf.sh.intel.com>
Date:	Fri, 29 Sep 2006 09:53:33 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] Add flag __GFP_NOFAIL when allocating block

From: Zhang, Yanmin <yanmin.zhang@...el.com>

Function journal_write_metadata_buffer doesn't estimate the return
value of jbd_slab_alloc. If the allocation fails, later jbd_slab_free
or memcpy will cause kernel oops.

Add flag __GFP_NOFAIL when allocating block. The patch is against
2.6.18-mm1.

Signed-off-by: Zhang Yanmin <yanmin.zhang@...el.com>

---

--- linux-2.6.18_mm1/fs/jbd/journal.c	2006-09-29 07:19:49.000000000 -0600
+++ linux-2.6.18_mm1_fix/fs/jbd/journal.c	2006-09-30 03:01:38.000000000 -0600
@@ -329,7 +329,7 @@ repeat:
 		char *tmp;
 
 		jbd_unlock_bh_state(bh_in);
-		tmp = jbd_slab_alloc(bh_in->b_size, GFP_NOFS);
+		tmp = jbd_slab_alloc(bh_in->b_size, GFP_NOFS|__GFP_NOFAIL);
 		jbd_lock_bh_state(bh_in);
 		if (jh_in->b_frozen_data) {
 			jbd_slab_free(tmp, bh_in->b_size);
-
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