KEYS: trusted: fix -Wvarags warning

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@aculab.com>
Suggested-by: Denis Kenzior <denkenz@gmail.com>
Suggested-by: James Bottomley <jejb@linux.vnet.ibm.com>
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.morris@microsoft.com>

diff --git a/include/keys/trusted.h b/include/keys/trusted.h
index adbcb681782604b5356a0b1db56a9a9af6177529..0071298b9b28eb41a313e7f29eb609bd84eb4785 100644 (file)
--- 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 a284d790de8c382526a345cfb60b181ab424f4f0..efdbf17f3915259ea34ed76f5d452a4763236043 100644 (file)
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -125,7 +125,7 @@ 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;
@@ -144,7 +144,7 @@ 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;