linux-kernel - [PATCH] misc: fastrpc: fix potential fastrpc_invoke

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Date:   Mon, 11 May 2020 17:29:27 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        arnd@...db.de,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] misc: fastrpc: fix potential fastrpc_invoke_ctx leak

fastrpc_invoke_ctx can have refcount of 2 in error path where
rpmsg_send() fails to send invoke message. decrement the refcount
properly in the error path to fix this leak.

This also fixes below static checker warning:

drivers/misc/fastrpc.c:990 fastrpc_internal_invoke()
warn: 'ctx->refcount.refcount.ref.counter' not decremented on lines: 990.

Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 9065d3e71ff7..07065728e39f 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -949,8 +949,10 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 	dma_wmb();
 	/* Send invoke buffer to remote dsp */
 	err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
-	if (err)
+	if (err) {
+		fastrpc_context_put(ctx);
 		goto bail;
+	}
 
 	if (kernel) {
 		if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
-- 
2.21.0