FAILED: patch "[PATCH] crypto: testmgr - skip crc32c context test for ahash" failed to apply to 3.18-stable tree

The patch below does not apply to the 3.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From eb5e6730db98fcc4b51148b4a819fa4bf864ae54 Mon Sep 17 00:00:00 2001
From: Eric Biggers <[email protected]>
Date: Wed, 23 Jan 2019 20:57:35 -0800
Subject: [PATCH] crypto: testmgr - skip crc32c context test for ahash
algorithms

Instantiating "cryptd(crc32c)" causes a crypto self-test failure because the crypto_alloc_shash() in alg_test_crc32c() fails. This is because cryptd(crc32c) is an ahash algorithm, not a shash algorithm; so it can only be accessed through the ahash API, unlike shash algorithms which can be accessed through both the ahash and shash APIs.

As the test is testing the shash descriptor format which is only applicable to shash algorithms, skip it for ahash algorithms.

(Note that it's still important to fix crypto self-test failures even
for weird algorithm instantiations like cryptd(crc32c) that no one would really use; in fips_enabled mode unprivileged users can use them to panic the kernel, and also they prevent treating a crypto self-test failure as a bug when fuzzing the kernel.)

index 4ac3d22256c3..a73455b543ad 100644
@@ -1909,14 +1909,21 @@ static int alg_test_crc32c(const struct alg_test_desc *desc,
 
 	err = alg_test_hash(desc, driver, type, mask);
 	if (err)
-		goto out;
+		return err;
 
 	tfm = crypto_alloc_shash(driver, type, mask);
 	if (IS_ERR(tfm)) {
+		if (PTR_ERR(tfm) == -ENOENT) {
+			/*
+			 * This crc32c implementation is only available through
+			 * ahash API, not the shash API, so the remaining part
+			 * of the test is not applicable to it.
+			 */
+			return 0;
+		}
 		printk(KERN_ERR "alg: crc32c: Failed to load transform for %s: "
 		       "%ld\n", driver, PTR_ERR(tfm));
-		err = PTR_ERR(tfm);
-		goto out;
+		return PTR_ERR(tfm);
 	}
 
 	do {

@@ -1943,7 +1950,6 @@ static int alg_test_crc32c(const struct alg_test_desc *desc,
 
 	crypto_free_shash(tfm);
 
-out:
 	return err;
 }