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net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid 

[ Upstream commit 7ca1db21ef ]

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@syzkaller.appspotmail.com
Tested-by: syzbot+75d51fe5bf4ebe988518@syzkaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Anant Thazhemadam 2020-10-12 09:54:04 +05:30 committed by Greg Kroah-Hartman
parent 660e2d9d14
commit 229bdf0b13
1 changed files with 1 additions and 1 deletions
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net/9p/trans_fd.c
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@ -1023,7 +1023,7 @@ 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) {