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* [PATCH] [PATCH] rapidio: Potential oops in riocm_ch_listen()
@ 2019-01-10 13:02 Dan Carpenter
  0 siblings, 0 replies; only message in thread
From: Dan Carpenter @ 2019-01-10 13:02 UTC (permalink / raw)
  To: Matt Porter, Alexandre Bounine
  Cc: linux-kernel, kernel-janitors, Andrew Morton

If riocm_get_channel() fails, then we should just return -EINVAL.
Calling riocm_put_channel() will trigger a NULL dereference and
generally we should call put() if the get() didn't succeed.

Fixes: b6e8d4aa1110 ("rapidio: add RapidIO channelized messaging driver")
Signed-off-by: Dan Carpenter <>
 drivers/rapidio/rio_cm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/rapidio/rio_cm.c b/drivers/rapidio/rio_cm.c
index bad0e0ea4f30..cf45829585cb 100644
--- a/drivers/rapidio/rio_cm.c
+++ b/drivers/rapidio/rio_cm.c
@@ -1215,7 +1215,9 @@ static int riocm_ch_listen(u16 ch_id)
 	riocm_debug(CHOP, "(ch_%d)", ch_id);
 	ch = riocm_get_channel(ch_id);
-	if (!ch || !riocm_cmp_exch(ch, RIO_CM_CHAN_BOUND, RIO_CM_LISTEN))
+	if (!ch)
+		return -EINVAL;
+	if (!riocm_cmp_exch(ch, RIO_CM_CHAN_BOUND, RIO_CM_LISTEN))
 		ret = -EINVAL;
 	return ret;

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2019-01-10 13:02 [PATCH] [PATCH] rapidio: Potential oops in riocm_ch_listen() Dan Carpenter

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