cfg80211: fix cfg80211_beacon_dup

[ Upstream commit bee92d06157fc39d5d7836a061c7d41289a55797 ]

gcc-8 warns about some obviously incorrect code:

net/mac80211/cfg.c: In function 'cfg80211_beacon_dup':
net/mac80211/cfg.c:2896:3: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

From the context, I conclude that we want to copy from beacon into
new_beacon, as we do in the rest of the function.

Cc: stable@vger.kernel.org
Fixes: 73da7d5bab79 ("mac80211: add channel switch command and beacon callbacks")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 37e0aa4891a20b533828a1d2d66cef53664b4735..cd85cbf9bf39c6e093ebfa83fa30a3a5ad70a988 100644 (file)
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2857,7 +2857,7 @@ cfg80211_beacon_dup(struct cfg80211_beacon_data *beacon)
        }
        if (beacon->probe_resp_len) {
                new_beacon->probe_resp_len = beacon->probe_resp_len;
-               beacon->probe_resp = pos;
+               new_beacon->probe_resp = pos;
                memcpy(pos, beacon->probe_resp, beacon->probe_resp_len);
                pos += beacon->probe_resp_len;
        }