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| author | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2020-05-12 12:09:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-15 16:21:08 +0200 |
| commit | 74003385cf716f1b88cc7753ca282f5493f204a2 (patch) | |
| tree | aaea188e33a9da5f4e3247c96e131e4ad82bd26a /drivers/misc/fastrpc.c | |
| parent | 0978de9fc7335c73934ab8fac189fb4cb3f23191 (diff) | |
| download | linux-stable-74003385cf716f1b88cc7753ca282f5493f204a2.tar.gz linux-stable-74003385cf716f1b88cc7753ca282f5493f204a2.tar.bz2 linux-stable-74003385cf716f1b88cc7753ca282f5493f204a2.zip | |
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@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.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/fastrpc.c')
| -rw-r--r-- | drivers/misc/fastrpc.c | 9 |
1 files changed, 8 insertions, 1 deletions
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, |