Messages in this thread Patch in this message | | | From | Jason Wang <> | Subject | [PATCH V4 1/2] ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE | Date | Fri, 9 Feb 2018 17:45:49 +0800 |
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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 <jasowang@redhat.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
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