1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0035-crypto-x86-chacha-only-unregister-algorithms-if-regi.patch b/target/linux/generic/backport-5.4/080-wireguard-0035-crypto-x86-chacha-only-unregister-algorithms-if-regi.patch
new file mode 100644
index 0000000000..4554ea898b
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0035-crypto-x86-chacha-only-unregister-algorithms-if-regi.patch
@@ -0,0 +1,31 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Eric Biggers <ebiggers@google.com>
+Date: Sun, 17 Nov 2019 23:21:58 -0800
+Subject: [PATCH] crypto: x86/chacha - only unregister algorithms if registered
+
+commit b62755aed3a3f5ca9edd2718339ccea3b6bbbe57 upstream.
+
+It's not valid to call crypto_unregister_skciphers() without a prior
+call to crypto_register_skciphers().
+
+Fixes: 84e03fa39fbe ("crypto: x86/chacha - expose SIMD ChaCha routine as library function")
+Signed-off-by: Eric Biggers <ebiggers@google.com>
+Acked-by: Ard Biesheuvel <ardb@kernel.org>
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ arch/x86/crypto/chacha_glue.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/arch/x86/crypto/chacha_glue.c
++++ b/arch/x86/crypto/chacha_glue.c
+@@ -304,7 +304,8 @@ static int __init chacha_simd_mod_init(v
+ 
+ static void __exit chacha_simd_mod_fini(void)
+ {
+-	crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
++	if (boot_cpu_has(X86_FEATURE_SSSE3))
++		crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
+ }
+ 
+ module_init(chacha_simd_mod_init);