Commit "aio: percpu reqs_available" added some math to the nr_requests
calculation, but didn't correct the overflow calculations to handle that.
This means that this:
#include <linux/aio_abi.h>
void main(void)
{
aio_context_t ctx_idp;
io_setup(0x80000001, &ctx_idp);
}
Would trigger the newly added BUG() couple of lines after the overflow
checks.
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/aio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/aio.c b/fs/aio.c
index 5b7ed78..0ae450a 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -411,7 +411,8 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
/* Prevent overflows */
if ((nr_events > (0x10000000U / sizeof(struct io_event))) ||
- (nr_events > (0x10000000U / sizeof(struct kiocb)))) {
+ (nr_events > (0x10000000U / sizeof(struct kiocb))) ||
+ (nr_events < num_possible_cpus() * 4)) {
pr_debug("ENOMEM: nr_events too high\n");
return ERR_PTR(-EINVAL);
}
--
1.8.2.1
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