3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: "Jason A. Donenfeld" Jason@zx2c4.com
commit 2bdd713b92a9cade239d3c7d15205a09f556624d upstream.
Otherwise we risk leaking information via timing side channel.
Fixes: fdf7cb4185b6 ("mac80211: accept key reinstall without changing anything") Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- net/mac80211/key.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/mac80211/key.c +++ b/net/mac80211/key.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/export.h> #include <net/mac80211.h> +#include <crypto/algapi.h> #include <asm/unaligned.h> #include "ieee80211_i.h" #include "driver-ops.h" @@ -503,7 +504,7 @@ int ieee80211_key_link(struct ieee80211_ * new version of the key to avoid nonce reuse or replay issues. */ if (old_key && key->conf.keylen == old_key->conf.keylen && - !memcmp(key->conf.key, old_key->conf.key, key->conf.keylen)) { + !crypto_memneq(key->conf.key, old_key->conf.key, key->conf.keylen)) { ieee80211_key_free_unused(key); ret = 0; goto out;