From: Jason Wang Date: Fri, 9 Feb 2018 09:45:49 +0000 (+0800) Subject: ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE X-Git-Tag: xilinx-dt-for-4.17~36^2~5 X-Git-Url: https://rtime.felk.cvut.cz/gitweb/zynq/linux.git/commitdiff_plain/6e6e41c3112276288ccaf80c70916779b84bb276 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@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 --- diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index 1883d6137e9b..6051a5fe6913 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); }