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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@syzkaller.appspotmail.com
Fixes: 2e0ab8ca83 ("ptr_ring: array based FIFO for pointers")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2018-02-09 17:45:50 +08:00 committed by David S. Miller
parent 6e6e41c311
commit 0bf7800f17
1 changed files with 8 additions and 5 deletions
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13
include/linux/ptr_ring.h
View File

@ -464,11 +464,14 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r,
__PTR_RING_PEEK_CALL_v; \ __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) static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp)
{ {
if (size * sizeof(void *) > KMALLOC_MAX_SIZE) if (size * sizeof(void *) > KMALLOC_MAX_SIZE)
return NULL; 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) static inline void __ptr_ring_set_size(struct ptr_ring *r, int size)
@ -603,7 +606,7 @@ static inline int ptr_ring_resize(struct ptr_ring *r, int size, gfp_t gfp,
spin_unlock(&(r)->producer_lock); spin_unlock(&(r)->producer_lock);
spin_unlock_irqrestore(&(r)->consumer_lock, flags); spin_unlock_irqrestore(&(r)->consumer_lock, flags);
kfree(old); kvfree(old);
return 0; return 0;
} }
@ -643,7 +646,7 @@ static inline int ptr_ring_resize_multiple(struct ptr_ring **rings,
} }
for (i = 0; i < nrings; ++i) for (i = 0; i < nrings; ++i)
kfree(queues[i]); kvfree(queues[i]);
kfree(queues); kfree(queues);
@ -651,7 +654,7 @@ static inline int ptr_ring_resize_multiple(struct ptr_ring **rings,
nomem: nomem:
while (--i >= 0) while (--i >= 0)
kfree(queues[i]); kvfree(queues[i]);
kfree(queues); kfree(queues);
@ -666,7 +669,7 @@ static inline void ptr_ring_cleanup(struct ptr_ring *r, void (*destroy)(void *))
if (destroy) if (destroy)
while ((ptr = ptr_ring_consume(r))) while ((ptr = ptr_ring_consume(r)))
destroy(ptr); destroy(ptr);
kfree(r->queue); kvfree(r->queue);
} }
#endif /* _LINUX_PTR_RING_H */ #endif /* _LINUX_PTR_RING_H */