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aio: avoid request count overflow in ioctx_alloc() #2951

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aio: avoid request count overflow in ioctx_alloc() #2951

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5 changes: 2 additions & 3 deletions fs/aio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -805,13 +805,12 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
* counters at a time, so make sure that isn't 0:
*/
nr_events = max(nr_events, num_possible_cpus() * 4);
nr_events *= 2;

/* Prevent overflows */
if (nr_events > (0x10000000U / sizeof(struct io_event))) {
if (nr_events > (0x8000000U / sizeof(struct io_event))) {
pr_debug("ENOMEM: nr_events too high\n");
return ERR_PTR(-EINVAL);
}
nr_events *= 2;

if (!nr_events || (unsigned long)max_reqs > aio_max_nr)
return ERR_PTR(-EAGAIN);
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