linux-kernel - do_wait: Add missing tasklist unlocking in error paths.

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Message-ID: <20130920163733.GA24958@redhat.com>
Date:	Fri, 20 Sep 2013 12:37:33 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	oleg@...hat.com, roland@...k.frob.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: do_wait: Add missing tasklist unlocking in error paths.

It looks like both 64a16caf5, and 98abed020 both introduced error paths to do_wait
where we miss unlocking the tasklist. 

Spotted with coverity.

Signed-off-by: Dave Jones <davej@...oraproject.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index a949819..27004a6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1526,13 +1526,15 @@ repeat:
 	tsk = current;
 	do {
 		retval = do_wait_thread(wo, tsk);
-		if (retval)
+		if (retval) {
+			read_unlock(&tasklist_lock);
 			goto end;
-
+		}
 		retval = ptrace_do_wait(wo, tsk);
-		if (retval)
+		if (retval) {
+			read_unlock(&tasklist_lock);
 			goto end;
-
+		}
 		if (wo->wo_flags & __WNOTHREAD)
 			break;
 	} while_each_thread(current, tsk);
--
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