From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50336 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965490AbeBWS5w (ORCPT ); Fri, 23 Feb 2018 13:57:52 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com, Jason Wang , "Michael S. Tsirkin" , "David S. Miller" Subject: [PATCH 4.15 03/45] ptr_ring: try vmalloc() when kmalloc() fails Date: Fri, 23 Feb 2018 19:28:42 +0100 Message-Id: <20180223170715.783010673@linuxfoundation.org> In-Reply-To: <20180223170715.197760019@linuxfoundation.org> References: <20180223170715.197760019@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang commit 0bf7800f1799b5b1fd7d4f024e9ece53ac489011 upstream. This patch switch to use kvmalloc_array() for using a vmalloc() fallback to help in case kmalloc() fails. Reported-by: syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com Fixes: 2e0ab8ca83c12 ("ptr_ring: array based FIFO for pointers") Signed-off-by: Jason Wang Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/ptr_ring.h | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -451,11 +451,14 @@ static inline int ptr_ring_consume_batch __PTR_RING_PEEK_CALL_v; \ }) +/* Not all gfp_t flags (besides GFP_KERNEL) are allowed. See + * documentation for vmalloc for which of them are legal. + */ 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); + return kvmalloc_array(size, sizeof(void *), gfp | __GFP_ZERO); } static inline void __ptr_ring_set_size(struct ptr_ring *r, int size) @@ -588,7 +591,7 @@ static inline int ptr_ring_resize(struct spin_unlock(&(r)->producer_lock); spin_unlock_irqrestore(&(r)->consumer_lock, flags); - kfree(old); + kvfree(old); return 0; } @@ -628,7 +631,7 @@ static inline int ptr_ring_resize_multip } for (i = 0; i < nrings; ++i) - kfree(queues[i]); + kvfree(queues[i]); kfree(queues); @@ -636,7 +639,7 @@ static inline int ptr_ring_resize_multip nomem: while (--i >= 0) - kfree(queues[i]); + kvfree(queues[i]); kfree(queues); @@ -651,7 +654,7 @@ static inline void ptr_ring_cleanup(stru if (destroy) while ((ptr = ptr_ring_consume(r))) destroy(ptr); - kfree(r->queue); + kvfree(r->queue); } #endif /* _LINUX_PTR_RING_H */