5.4-stable review patch. If anyone has any objections, please let me know.
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From: Shigeru Yoshida syoshida@redhat.com
[ Upstream commit fa96c6baef1b5385e2f0c0677b32b3839e716076 ]
tipc_udp_addr2str() should return non-zero value if the UDP media address is invalid. Otherwise, a buffer overflow access can occur in tipc_media_addr_printf(). Fix this by returning 1 on an invalid UDP media address.
Fixes: d0f91938bede ("tipc: add ip/udp media type") Signed-off-by: Shigeru Yoshida syoshida@redhat.com Reviewed-by: Tung Nguyen tung.q.nguyen@endava.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/tipc/udp_media.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c index 1fb0535e2eb47..4db2185a32aec 100644 --- a/net/tipc/udp_media.c +++ b/net/tipc/udp_media.c @@ -128,8 +128,11 @@ static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); else if (ntohs(ua->proto) == ETH_P_IPV6) snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); - else + else { pr_err("Invalid UDP media address\n"); + return 1; + } + return 0; }