From 34deb5387ed5cfaa41606779e90be5b24b3a055b Mon Sep 17 00:00:00 2001 From: Horia Geantă Date: Mon, 19 Jun 2017 11:44:45 +0300 Subject: crypto: caam - fix gfp allocation flags (part I) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit commit 42cfcafb91dabb0f9d9e08396c39824535948c67 upstream. Changes in the SW cts (ciphertext stealing) code in commit 0605c41cc53ca ("crypto: cts - Convert to skcipher") revealed a problem in the CAAM driver: when cts(cbc(aes)) is executed and cts runs in SW, cbc(aes) is offloaded in CAAM; cts encrypts the last block in atomic context and CAAM incorrectly decides to use GFP_KERNEL for memory allocation. Fix this by allowing GFP_KERNEL (sleeping) only when MAY_SLEEP flag is set, i.e. remove MAY_BACKLOG flag. We split the fix in two parts - first is sent to -stable, while the second is not (since there is no known failure case). Link: http://lkml.kernel.org/g/20170602122446.2427-1-david@sigma-star.at Reported-by: David Gstir Signed-off-by: Horia Geantă Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- drivers/crypto/caam/caamalg.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c index 9bc80eb06934..b4e3f4ef5c05 100644 --- a/drivers/crypto/caam/caamalg.c +++ b/drivers/crypto/caam/caamalg.c @@ -1474,8 +1474,7 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req); struct caam_ctx *ctx = crypto_ablkcipher_ctx(ablkcipher); struct device *jrdev = ctx->jrdev; - gfp_t flags = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG | - CRYPTO_TFM_REQ_MAY_SLEEP)) ? + gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC; int src_nents, mapped_src_nents, dst_nents = 0, mapped_dst_nents = 0; struct ablkcipher_edesc *edesc; -- cgit v1.2.3