[PULL,06/13] qdict: fix unbounded stack warning for qdict_array_entries

Commit Message

Michael Tokarev May 18, 2016, 12:06 p.m. UTC

From: Peter Xu <[e-mail]>

Here we use one g_strdup_printf() to replace the two stack allocated
array, considering it's more convenient, safe, and as long as it's
called rarely only when quorum device opens. This will remove the
unbound stack warning when compiling with "-Wstack-usage=1000000".

Reviewed-by:   Eric Blake <[e-mail]>
Signed-off-by: Peter Xu <[e-mail]>
Reviewed-by: Markus Armbruster <[e-mail]>
Signed-off-by: Michael Tokarev <[e-mail]>
---
 qobject/qdict.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

Patch

diff --git a/qobject/qdict.c b/qobject/qdict.c
index a128536..60f158c 100644
--- a/qobject/qdict.c
+++ b/qobject/qdict.c
@@ -705,19 +705,16 @@  int qdict_array_entries(QDict *src, const char *subqdict)
     for (i = 0; i < INT_MAX; i++) {
         QObject *subqobj;
         int subqdict_entries;
-        size_t slen = 32 + subqdict_len;
-        char indexstr[slen], prefix[slen];
-        size_t snprintf_ret;
+        char *prefix = g_strdup_printf("%s%u.", subqdict, i);
 
-        snprintf_ret = snprintf(indexstr, slen, "%s%u", subqdict, i);
-        assert(snprintf_ret < slen);
+        subqdict_entries = qdict_count_prefixed_entries(src, prefix);
 
-        subqobj = qdict_get(src, indexstr);
+        /* Remove ending "." */
+        prefix[strlen(prefix) - 1] = 0;
+        subqobj = qdict_get(src, prefix);
 
-        snprintf_ret = snprintf(prefix, slen, "%s%u.", subqdict, i);
-        assert(snprintf_ret < slen);
+        g_free(prefix);
 
-        subqdict_entries = qdict_count_prefixed_entries(src, prefix);
         if (subqdict_entries < 0) {
             return subqdict_entries;
         }