From: Eugene Syromiatnikov <esyr@redhat.com>
Date: Thu, 20 Dec 2018 15:35:27 +0000 (+0100)
Subject: evdev: fix off-by-one error in decode_bitset
X-Git-Tag: v4.26~36
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8a5feb1cb331441d1b721b6455ee95b50258dbac;p=strace

evdev: fix off-by-one error in decode_bitset

* evdev.c (decode_bitset): Decrement sorted/indexed xlat's size by one
in order to account for guarding XLAT_END, as other sorted/indexed xlat
wrappers do.

Fixes: v4.23~261 "evdev: support various types of xlats in decode_bitset"
---

diff --git a/evdev.c b/evdev.c
index 325477c7..8d22d08e 100644
--- a/evdev.c
+++ b/evdev.c
@@ -188,7 +188,7 @@ decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
 
 #define decode_bitset(tcp_, arg_, decode_nr_, max_nr_, dflt_, xt_) \
 	decode_bitset_((tcp_), (arg_), (decode_nr_), (max_nr_), \
-		       (dflt_), ARRAY_SIZE(decode_nr_), (xt_))
+		       (dflt_), ARRAY_SIZE(decode_nr_) - 1, (xt_))
 
 # ifdef EVIOCGMTSLOTS
 static int