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drivers/rapidio/rio_cm.c: fix potential oops in riocm_ch_listen()

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[ Upstream commit 5ac188b12e ]

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: b6e8d4aa11 ("rapidio: add RapidIO channelized messaging driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2019-03-07 16:29:33 -08:00 committed by Greg Kroah-Hartman
parent d6bf70766f
commit 5ba5c4da88
1 changed files with 3 additions and 1 deletions
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4
drivers/rapidio/rio_cm.c
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@ -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;