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authorGilad Ben-Yossef <gilad@benyossef.com>2017-05-18 16:29:24 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2017-05-23 12:45:11 +0800
commita5dfefb1c3f3db81662556393fd9283511e08430 (patch)
tree34d6e7ae619ec2d574edb548bce8831b22f8c247 /crypto
parente68368aed56324e2e38d4f6b044bb8cf82077fc2 (diff)
crypto: drbg - wait for crypto op not signal safe
drbg_kcapi_sym_ctr() was using wait_for_completion_interruptible() to wait for completion of async crypto op but if a signal occurs it may return before DMA ops of HW crypto provider finish, thus corrupting the output buffer. Resolve this by using wait_for_completion() instead. Reported-by: Eric Biggers <ebiggers3@gmail.com> Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> CC: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/drbg.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c
index fa749f470135..cdb27ac4b226 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1767,9 +1767,8 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
break;
case -EINPROGRESS:
case -EBUSY:
- ret = wait_for_completion_interruptible(
- &drbg->ctr_completion);
- if (!ret && !drbg->ctr_async_err) {
+ wait_for_completion(&drbg->ctr_completion);
+ if (!drbg->ctr_async_err) {
reinit_completion(&drbg->ctr_completion);
break;
}

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