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From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Dan Carpenter <dan.carpenter@oracle.com>
Subject: [PATCH v2] misc: fastrpc: fix potential fastrpc_invoke_ctx leak
Date: Tue, 12 May 2020 12:09:30 +0100
Message-ID: <20200512110930.2550-1-srinivas.kandagatla@linaro.org> (raw)

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@oracle.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
Changes since v1:
	moved fastrpc_context_put to fastrpc_invoke_send()

 drivers/misc/fastrpc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 9065d3e71ff7..7939c55daceb 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -904,6 +904,7 @@ static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 	struct fastrpc_channel_ctx *cctx;
 	struct fastrpc_user *fl = ctx->fl;
 	struct fastrpc_msg *msg = &ctx->msg;
+	int ret;
 
 	cctx = fl->cctx;
 	msg->pid = fl->tgid;
@@ -919,7 +920,13 @@ static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 	msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
 	fastrpc_context_get(ctx);
 
-	return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
+	ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
+
+	if (ret)
+		fastrpc_context_put(ctx);
+
+	return ret;
+
 }
 
 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
-- 
2.21.0


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12 11:09 Srinivas Kandagatla [this message]
2020-05-12 17:29 ` Bjorn Andersson

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