The iwd daemon uses libell which sets up the skcipher operation with
two separate control messages. This is fine by itself but the first
control message is sent without MSG_MORE. This means that the first
control message is interpreted as an empty request.
While libell should be fixed to use MSG_MORE where appropriate, this
patch works around the bug in the kernel so that existing binaries
continue to work.
We will print a warning however.
Reported-by: Caleb Jorden <caljorden@xxxxxxxxxxx>
Fixes: f3c802a1f300 ("crypto: algif_aead - Only wake up when...")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index a6f581ab200c..3da21cadc326 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/net.h>
#include <linux/rwsem.h>
+#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/security.h>
@@ -846,8 +847,14 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
lock_sock(sk);
if (ctx->init && (init || !ctx->more)) {
- err = -EINVAL;
- goto unlock;
+ if (ctx->used) {
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ pr_info_once(
+ "%s sent an empty control message without MSG_MORE.\n",
+ current->comm);
}
ctx->init = true;
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
