[PATCH 4/7] Avoid Coverity FORWARD_NULL prior to strtok_r calls

[John Ferlan <jferlan@xxxxxxxxxx>]

The 'strtok_r' function requires passing a NULL as the first parameter
on subsequent calls in order to ensure the code picks up where it left
off on a previous call.  However, Coverity doesn't quite realize this
and points out that if a NULL was passed in as the third argument it would
result in a possible NULL deref because the strtok_r function will assign
the third argument to the first in the call is NULL.

Adding an sa_assert() prior to each initial call quiets Coverity

Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
---
 src/esx/esx_vi.c          | 1 +
 src/libxl/libxl_conf.c    | 1 +
 src/openvz/openvz_conf.c  | 2 ++
 src/xenapi/xenapi_utils.c | 1 +
 4 files changed, 5 insertions(+)

diff --git a/src/esx/esx_vi.c b/src/esx/esx_vi.c
index af822b1..a57d753 100644
--- a/src/esx/esx_vi.c
+++ b/src/esx/esx_vi.c
@@ -1173,6 +1173,7 @@ esxVI_Context_LookupManagedObjectsByPath(esxVI_Context *ctx, const char *path)
         goto cleanup;
 
     /* Lookup Datacenter */
+    sa_assert(tmp);
     item = strtok_r(tmp, "/", &saveptr);
 
     if (!item) {
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index e845759..7223ba2 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -353,6 +353,7 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
     /* Split capabilities string into tokens. strtok_r is OK here because
      * we "own" the buffer.  Parse out the features from each token.
      */
+    sa_assert(ver_info->capabilities);
     for (str = ver_info->capabilities, nr_guest_archs = 0;
          nr_guest_archs < sizeof(guest_archs) / sizeof(guest_archs[0])
                  && (token = strtok_r(str, " ", &saveptr)) != NULL;
diff --git a/src/openvz/openvz_conf.c b/src/openvz/openvz_conf.c
index 49d78c6..18cf6bd 100644
--- a/src/openvz/openvz_conf.c
+++ b/src/openvz/openvz_conf.c
@@ -138,6 +138,7 @@ openvzParseBarrierLimit(const char* value,
     char *str;
     int ret = -1;
 
+    sa_assert(value);
     if (VIR_STRDUP(str, value) < 0)
         goto error;
 
@@ -965,6 +966,7 @@ openvzGetVPSUUID(int vpsid, char *uuidstr, size_t len)
             }
         }
 
+        sa_assert(line);
         iden = strtok_r(line, " ", &saveptr);
         uuidbuf = strtok_r(NULL, "\n", &saveptr);
 
diff --git a/src/xenapi/xenapi_utils.c b/src/xenapi/xenapi_utils.c
index a80e084..6b710cd 100644
--- a/src/xenapi/xenapi_utils.c
+++ b/src/xenapi/xenapi_utils.c
@@ -301,6 +301,7 @@ getCpuBitMapfromString(char *mask, unsigned char *cpumap, int maplen)
     int max_bits = maplen * 8;
     char *num = NULL, *bp = NULL;
     bzero(cpumap, maplen);
+    sa_assert(mask);
     num = strtok_r(mask, ",", &bp);
     while (num != NULL) {
         if (virStrToLong_i(num, NULL, 10, &pos) < 0)
-- 
2.1.0

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