From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
[ Upstream commit 74003385cf716f1b88cc7753ca282f5493f204a2 ]
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@xxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200512110930.2550-1-srinivas.kandagatla@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 ee3291f7e615..3a5d2890fe2a 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -886,6 +886,7 @@ 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;
@@ -901,7 +902,13 @@ 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,
--
2.25.1
