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crypto: skcipher - add might_sleep() to skcipher_walk_virt()

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skcipher_walk_virt() can still sleep even with atomic=true, since that
only affects the later calls to skcipher_walk_done().  But,
skcipher_walk_virt() only has to allocate memory for some input data
layouts, so incorrectly calling it with preemption disabled can go
undetected.  Use might_sleep() so that it's detected reliably.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2018-12-15 12:41:53 -08:00 committed by Herbert Xu
parent f9c9bdb513
commit bb648291fc
1 changed files with 2 additions and 0 deletions
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crypto/skcipher.c
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@ -474,6 +474,8 @@ int skcipher_walk_virt(struct skcipher_walk *walk,
{
int err;
might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
walk->flags &= ~SKCIPHER_WALK_PHYS;
err = skcipher_walk_skcipher(walk, req);