[PATCH] Silence 'may be used uninitialized in this function' warnings

[Jussi Kivilinna]

* cipher/arcfour.c (selftest): Initialize 'ctx'.
* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_ensure_compact): Initialize
'enc' and 'enclen'.
(_gcry_ecc_eddsa_sign, _gcry_ecc_eddsa_verify): Initialize 'encpklen'.
* mpi/mpi-pow.c (_gcry_mpi_powm): Initialize 'xsize'.
--

Warnings were seen on gcc-s390x build with optimization level -O3.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
---
 cipher/arcfour.c   | 2 +-
 cipher/ecc-eddsa.c | 8 ++++----
 mpi/mpi-pow.c      | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/cipher/arcfour.c b/cipher/arcfour.c
index 9e71857c..909e45b2 100644
--- a/cipher/arcfour.c
+++ b/cipher/arcfour.c
@@ -183,7 +183,7 @@ arcfour_setkey ( void *context, const byte *key, unsigned int keylen,
 static const char*
 selftest(void)
 {
-  ARCFOUR_context ctx;
+  ARCFOUR_context ctx = { { 0, }, };
   byte scratch[16];
 
   /* Test vector from Cryptlib labeled there: "from the
diff --git a/cipher/ecc-eddsa.c b/cipher/ecc-eddsa.c
index 2a1a8907..63c0ef3f 100644
--- a/cipher/ecc-eddsa.c
+++ b/cipher/ecc-eddsa.c
@@ -154,8 +154,8 @@ _gcry_ecc_eddsa_ensure_compact (gcry_mpi_t value, unsigned int nbits)
   const unsigned char *buf;
   unsigned int rawmpilen;
   gcry_mpi_t x, y;
-  unsigned char *enc;
-  unsigned int enclen;
+  unsigned char *enc = NULL;
+  unsigned int enclen = 0;
 
   if (!mpi_is_opaque (value))
     return GPG_ERR_INV_OBJ;
@@ -699,7 +699,7 @@ _gcry_ecc_eddsa_sign (gcry_mpi_t input, mpi_ec_t ec,
   unsigned char *rawmpi = NULL;
   unsigned int rawmpilen;
   unsigned char *encpk = NULL; /* Encoded public key.  */
-  unsigned int encpklen;
+  unsigned int encpklen = 0;
   mpi_point_struct I;          /* Intermediate value.  */
   gcry_mpi_t a, x, y, r;
   int b;
@@ -977,7 +977,7 @@ _gcry_ecc_eddsa_verify (gcry_mpi_t input, mpi_ec_t ec,
   int b;
   unsigned int tmp;
   unsigned char *encpk = NULL; /* Encoded public key.  */
-  unsigned int encpklen;
+  unsigned int encpklen = 0;
   const void *mbuf, *rbuf;
   unsigned char *tbuf = NULL;
   size_t mlen, rlen;
diff --git a/mpi/mpi-pow.c b/mpi/mpi-pow.c
index 62b4a808..defd675e 100644
--- a/mpi/mpi-pow.c
+++ b/mpi/mpi-pow.c
@@ -545,7 +545,7 @@ _gcry_mpi_powm (gcry_mpi_t res,
   {
     mpi_size_t i, j, k;
     mpi_ptr_t xp;
-    mpi_size_t xsize;
+    mpi_size_t xsize = 0;
     int c;
     mpi_limb_t e;
     mpi_limb_t carry_limb;
-- 
2.27.0