4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Cong Wang <cong.wang@xxxxxxxxxxxxx>
[ Upstream commit defd8b3c37b0f9cb3e0f60f47d3d78d459d57fda ]
When sockfd_lookup() fails, gtp_encap_enable_socket() returns a
NULL pointer, but its callers only check for error pointers thus miss
the NULL pointer case.
Fix it by returning an error pointer with the error code carried from
sockfd_lookup().
(I found this bug during code inspection.)
Fixes: 1e3a3abd8b28 ("gtp: make GTP sockets in gtp_newlink optional")
Cc: Andreas Schultz <aschultz@xxxxxxxx>
Cc: Harald Welte <laforge@xxxxxxxxxxxx>
Signed-off-by: Cong Wang <cong.wang@xxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Reviewed-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240825191638.146748-1-xiyou.wangcong@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/gtp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index cc80bd98e172d..733cafb0888f6 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -812,7 +812,7 @@ static struct sock *gtp_encap_enable_socket(int fd, int type,
sock = sockfd_lookup(fd, &err);
if (!sock) {
pr_debug("gtp socket fd=%d not found\n", fd);
- return NULL;
+ return ERR_PTR(err);
}
sk = sock->sk;
--
2.43.0
