netdev - [PATCH net V2 1/2] ptr_ring: try vmalloc() when kmalloc() fails

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Date:   Thu,  8 Feb 2018 11:21:40 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>
Subject: [PATCH net V2 1/2] ptr_ring: try vmalloc() when kmalloc() fails

This patch switch to use kvmalloc_array() for using a vmalloc()
fallback to help in case kmalloc() fails.

Reported-by: syzbot+e4d4f9ddd4295539735d@...kaller.appspotmail.com
Fixes: 2e0ab8ca83c12 ("ptr_ring: array based FIFO for pointers")
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 include/linux/ptr_ring.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h
index 1883d61..9c3b748 100644
--- a/include/linux/ptr_ring.h
+++ b/include/linux/ptr_ring.h
@@ -466,7 +466,7 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r,
 
 static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp)
 {
-	return kcalloc(size, sizeof(void *), gfp);
+	return kvmalloc_array(size, sizeof(void *), gfp | __GFP_ZERO);
 }
 
 static inline void __ptr_ring_set_size(struct ptr_ring *r, int size)
-- 
2.7.4