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Message-Id: <20200116172403.18149-76-sashal@kernel.org>
Date: Thu, 16 Jan 2020 12:20:05 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: 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 AUTOSEL 4.14 133/371] 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 ef989a15aefc..b29fc258eeba 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
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