linux-kernel - [PATCH AUTOSEL 4.4 18/25] net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid

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Message-Id: <20201027001123.1027642-18-sashal@kernel.org>
Date:   Mon, 26 Oct 2020 20:11:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Anant Thazhemadam <anant.thazhemadam@...il.com>,
        syzbot+75d51fe5bf4ebe988518@...kaller.appspotmail.com,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Sasha Levin <sashal@...nel.org>,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 18/25] net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid

From: Anant Thazhemadam <anant.thazhemadam@...il.com>

[ Upstream commit 7ca1db21ef8e0e6725b4d25deed1ca196f7efb28 ]

In p9_fd_create_unix, checking is performed to see if the addr (passed
as an argument) is NULL or not.
However, no check is performed to see if addr is a valid address, i.e.,
it doesn't entirely consist of only 0's.
The initialization of sun_server.sun_path to be equal to this faulty
addr value leads to an uninitialized variable, as detected by KMSAN.
Checking for this (faulty addr) and returning a negative error number
appropriately, resolves this issue.

Link: http://lkml.kernel.org/r/20201012042404.2508-1-anant.thazhemadam@gmail.com
Reported-by: syzbot+75d51fe5bf4ebe988518@...kaller.appspotmail.com
Tested-by: syzbot+75d51fe5bf4ebe988518@...kaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/9p/trans_fd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index eab058f93ec97..6f8e84844bb27 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -991,7 +991,7 @@ p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
 
 	csocket = NULL;
 
-	if (addr == NULL)
+	if (!addr || !strlen(addr))
 		return -EINVAL;
 
 	if (strlen(addr) >= UNIX_PATH_MAX) {
-- 
2.25.1