linux-kernel - [PATCH 4.9 095/271] drivers/rapidio/rio_cm.c: fix potential oops in riocm_ch

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Message-Id: <20200128135859.668659525@linuxfoundation.org>
Date:   Tue, 28 Jan 2020 15:04:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matt Porter <mporter@...nel.crashing.org>,
        Alexandre Bounine <alexandre.bounine@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 095/271] drivers/rapidio/rio_cm.c: fix potential oops in riocm_ch_listen()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 5ac188b12e7cbdd92dee60877d1fac913fc1d074 ]

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.

Link: http://lkml.kernel.org/r/20190110130230.GB27017@kadam
Fixes: b6e8d4aa1110 ("rapidio: add RapidIO channelized messaging driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@....com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 ef989a15aefc4..b29fc258eeba4 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;
 	riocm_put_channel(ch);
 	return ret;
-- 
2.20.1