[PATCH] Fix various uninitalized variable values. See CWE-457 for info.

[Joshua Rogers]

* common/iobuf.c: Fix uninitalized variable(s)
* g10/textfilter.c: Fix uninitalized variable(s)
* sm/keydb.c: Fix uninitalized variables(s)

--

All of these may be used before they are set(or in some cases
they are not set ever, and assumed to be 0/null)

Please note: There are 3 more:
/g10/keyring.c:
1011      byte afp[MAX_FINGERPRINT_LEN];

/g10/keygen.c:
305    byte sym[MAX_PREFS], hash[MAX_PREFS], zip[MAX_PREFS];

/g10/keylist.c:
770          char buf[(MAX_FINGERPRINT_LEN * 2) + 90];

But I do not know how to initialize them.

Signed-off-by: Joshua Rogers <git at internot.info>
---
 common/iobuf.c   | 2 +-
 g10/textfilter.c | 2 +-
 sm/keydb.c       | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/common/iobuf.c b/common/iobuf.c
index badbf78..3b13483 100644
--- a/common/iobuf.c
+++ b/common/iobuf.c
@@ -1476,7 +1476,7 @@ iobuf_openrw (const char *fname)
   iobuf_t a;
   gnupg_fd_t fp;
   file_filter_ctx_t *fcx;
-  size_t len;
+  size_t len = 0;
 
   if (!fname)
     return NULL;
diff --git a/g10/textfilter.c b/g10/textfilter.c
index 394d9c3..c6c4eec 100644
--- a/g10/textfilter.c
+++ b/g10/textfilter.c
@@ -165,7 +165,7 @@ copy_clearsig_text( IOBUF out, IOBUF inp, gcry_md_hd_t md,
 {
     unsigned int maxlen;
     byte *buffer = NULL;    /* malloced buffer */
-    unsigned int bufsize;   /* and size of this buffer */
+    unsigned int bufsize = 0;   /* and size of this buffer */
     unsigned int n;
     int truncated = 0;
     int pending_lf = 0;
diff --git a/sm/keydb.c b/sm/keydb.c
index 974625d..7bbbbec 100644
--- a/sm/keydb.c
+++ b/sm/keydb.c
@@ -958,7 +958,7 @@ int
 keydb_search (KEYDB_HANDLE hd, KEYDB_SEARCH_DESC *desc, size_t ndesc)
 {
   int rc = -1;
-  unsigned long skipped;
+  unsigned long skipped = 0;
 
   if (!hd)
     return gpg_error (GPG_ERR_INV_VALUE);
-- 
1.9.1