From: Srinivas Kandagatla srinivas.kandagatla@linaro.org
[ 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@oracle.com Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/20200512110930.2550-1-srinivas.kandagatla@linaro.o... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 ee3291f7e6156..3a5d2890fe2aa 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,