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gtp: allow -1 to be specified as file description from userspace

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Existing user space applications maintained by the Osmocom project are
breaking since a recent fix that addresses incorrect error checking.

Restore operation for user space programs that specify -1 as file
descriptor to skip GTPv0 or GTPv1 only sockets.

Fixes: defd8b3c37 ("gtp: fix a potential NULL pointer dereference")
Reported-by: Pau Espin Pedrol <pespin@sysmocom.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Tested-by: Oliver Smith <osmith@sysmocom.de>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241022144825.66740-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2024-10-22 16:48:25 +02:00 committed by Jakub Kicinski
parent 01e215975f
commit 7515e37bce
1 changed files with 13 additions and 9 deletions
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22
drivers/net/gtp.c
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@ -1702,20 +1702,24 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
return -EINVAL;
if (data[IFLA_GTP_FD0]) {
u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
int fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
if (IS_ERR(sk0))
return PTR_ERR(sk0);
if (fd0 >= 0) {
sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
if (IS_ERR(sk0))
return PTR_ERR(sk0);
}
}
if (data[IFLA_GTP_FD1]) {
u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
int fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
if (IS_ERR(sk1u)) {
gtp_encap_disable_sock(sk0);
return PTR_ERR(sk1u);
if (fd1 >= 0) {
sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
if (IS_ERR(sk1u)) {
gtp_encap_disable_sock(sk0);
return PTR_ERR(sk1u);
}
}
}