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authorAnant Thazhemadam <anant.thazhemadam@gmail.com>2020-10-12 07:24:04 +0300
committerDominique Martinet <asmadeus@codewreck.org>2020-10-12 11:05:47 +0300
commit7ca1db21ef8e0e6725b4d25deed1ca196f7efb28 (patch)
tree95f1225ce898c15c14a7eecb8203940ed25b96b8 /net/9p
parent316a1bef0d1622410c9f0f301173d0a03168ce37 (diff)
downloadlinux-7ca1db21ef8e0e6725b4d25deed1ca196f7efb28.tar.xz
net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid
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>
Diffstat (limited to 'net/9p')
-rw-r--r--net/9p/trans_fd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index c0762a302162..8f528e783a6c 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -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) {