linux-kernel - [PATCH V4 1/2] ptr_ring: fail early if queue occupies more than KMALLOC_MAX

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Message-Id: <1518169550-5987-1-git-send-email-jasowang@redhat.com>
Date:   Fri,  9 Feb 2018 17:45:49 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>
Subject: [PATCH V4 1/2] ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE

To avoid slab to warn about exceeded size, fail early if queue
occupies more than KMALLOC_MAX_SIZE.

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, 2 insertions(+)

diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h
index 1883d61..6051a5f 100644
--- a/include/linux/ptr_ring.h
+++ b/include/linux/ptr_ring.h
@@ -466,6 +466,8 @@ 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)
 {
+	if (size * sizeof(void *) > KMALLOC_MAX_SIZE)
+		return NULL;
 	return kcalloc(size, sizeof(void *), gfp);
 }
 
-- 
2.7.4