From: Dmitry V. Levin <ldv@altlinux.org>
Date: Sun, 23 Dec 2018 22:12:36 +0000 (+0000)
Subject: netlink_smc_diag: fix off-by-one error in xlat lookup
X-Git-Tag: v4.26~33
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=73f565d1b836fa1d6af86efe7838f8407368508c;p=strace

netlink_smc_diag: fix off-by-one error in xlat lookup

* netlink_smc_diag.c (decode_smc_diag_shutdown): Decrement xlat size
by one to account for XLAT_END as other users of xlats do.

Fixes: v4.25~54 "netlink_smc_diag: decode SMC_DIAG_SHUTDOWN attribute value"
---

diff --git a/netlink_smc_diag.c b/netlink_smc_diag.c
index 88337829..25809fc8 100644
--- a/netlink_smc_diag.c
+++ b/netlink_smc_diag.c
@@ -136,7 +136,7 @@ decode_smc_diag_shutdown(struct tcb *const tcp,
 			 const void *const opaque_data)
 {
 	const struct decode_nla_xlat_opts opts = {
-		ARRSZ_PAIR(sock_shutdown_flags), "???_SHUTDOWN",
+		ARRSZ_PAIR(sock_shutdown_flags) - 1, "???_SHUTDOWN",
 		.size = 1,
 	};