[PATCH AUTOSEL 5.0 52/79] KEYS: trusted: fix -Wvarags warning

[Sasha Levin]

From: "ndesaulniers at google.com" <ndesaulniers at google.com>

[ Upstream commit be24b37e22c20cbaa891971616784dd0f35211e8 ]

Fixes the warning reported by Clang:
security/keys/trusted.c:146:17: warning: passing an object that
undergoes default
      argument promotion to 'va_start' has undefined behavior [-Wvarargs]
        va_start(argp, h3);
                       ^
security/keys/trusted.c:126:37: note: parameter of type 'unsigned
char' is declared here
unsigned char *h2, unsigned char h3, ...)
                               ^
Specifically, it seems that both the C90 (4.8.1.1) and C11 (7.16.1.4)
standards explicitly call this out as undefined behavior:

The parameter parmN is the identifier of the rightmost parameter in
the variable parameter list in the function definition (the one just
before the ...). If the parameter parmN is declared with ... or with a
type that is not compatible with the type that results after
application of the default argument promotions, the behavior is
undefined.

Link: https://github.com/ClangBuiltLinux/linux/issues/41
Link: https://www.eskimo.com/~scs/cclass/int/sx11c.html
Suggested-by: David Laight <David.Laight at aculab.com>
Suggested-by: Denis Kenzior <denkenz at gmail.com>
Suggested-by: James Bottomley <jejb at linux.vnet.ibm.com>
Suggested-by: Nathan Chancellor <natechancellor at gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers at google.com>
Reviewed-by: Nathan Chancellor <natechancellor at gmail.com>
Tested-by: Nathan Chancellor <natechancellor at gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Signed-off-by: James Morris <james.morris at microsoft.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 include/keys/trusted.h  | 2 +-
 security/keys/trusted.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/keys/trusted.h b/include/keys/trusted.h
index adbcb6817826..0071298b9b28 100644
--- a/include/keys/trusted.h
+++ b/include/keys/trusted.h
@@ -38,7 +38,7 @@ enum {
 
 int TSS_authhmac(unsigned char *digest, const unsigned char *key,
 			unsigned int keylen, unsigned char *h1,
-			unsigned char *h2, unsigned char h3, ...);
+			unsigned char *h2, unsigned int h3, ...);
 int TSS_checkhmac1(unsigned char *buffer,
 			  const uint32_t command,
 			  const unsigned char *ononce,
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 4d98f4f87236..94d2b28c7c22 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -123,7 +123,7 @@ out:
  */
 int TSS_authhmac(unsigned char *digest, const unsigned char *key,
 			unsigned int keylen, unsigned char *h1,
-			unsigned char *h2, unsigned char h3, ...)
+			unsigned char *h2, unsigned int h3, ...)
 {
 	unsigned char paramdigest[SHA1_DIGEST_SIZE];
 	struct sdesc *sdesc;
@@ -139,7 +139,7 @@ int TSS_authhmac(unsigned char *digest, const unsigned char *key,
 		return PTR_ERR(sdesc);
 	}
 
-	c = h3;
+	c = !!h3;
 	ret = crypto_shash_init(&sdesc->shash);
 	if (ret < 0)
 		goto out;
-- 
2.19.1