From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 8 Apr 2025 05:17:20 +0000 (+0800)
Subject: crypto: caam/qi - Fix drv_ctx refcount bug
X-Git-Tag: v5.15.181~207
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=877ee3ba2f78c3cdb3eddd6517e8f9807ea9ceb3;p=thirdparty%2Fkernel%2Fstable.git

crypto: caam/qi - Fix drv_ctx refcount bug

commit b7b39df7e710b0068356e4c696af07aa10e2cd3d upstream.

Ensure refcount is raised before request is enqueued since it could
be dequeued before the call returns.

Reported-by: Sean Anderson <sean.anderson@linux.dev>
Cc: <stable@vger.kernel.org>
Fixes: 11144416a755 ("crypto: caam/qi - optimize frame queue cleanup")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Tested-by: Sean Anderson <sean.anderson@linux.dev>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/crypto/caam/qi.c b/drivers/crypto/caam/qi.c
index 2c52bf7d31ea5..d450708e07d68 100644
--- a/drivers/crypto/caam/qi.c
+++ b/drivers/crypto/caam/qi.c
@@ -115,12 +115,12 @@ int caam_qi_enqueue(struct device *qidev, struct caam_drv_req *req)
 	qm_fd_addr_set64(&fd, addr);
 
 	do {
+		refcount_inc(&req->drv_ctx->refcnt);
 		ret = qman_enqueue(req->drv_ctx->req_fq, &fd);
-		if (likely(!ret)) {
-			refcount_inc(&req->drv_ctx->refcnt);
+		if (likely(!ret))
 			return 0;
-		}
 
+		refcount_dec(&req->drv_ctx->refcnt);
 		if (ret != -EBUSY)
 			break;
 		num_retries++;