sds: fix off by 1 bug in flb_sds_printf

Note: this is a port of Wesleys fix in fluent-bit Signed-off-by: Leonardo Alminana <[email protected]>
fluent · Apr 25, 2023 · fde4d8a · fde4d8a
1 parent 82839c4
commit fde4d8a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/cfl_sds.c b/src/cfl_sds.c
@@ -211,8 +211,8 @@ cfl_sds_t cfl_sds_printf(cfl_sds_t *sds, const char *fmt, ...)
     }
     va_end(ap);
 
-    if (size > cfl_sds_avail(s)) {
-        tmp = cfl_sds_increase(s, size);
+    if (size >= cfl_sds_avail(s)) {
+        tmp = cfl_sds_increase(s, size - flb_sds_avail(s) + 1);
         if (!tmp) {
             return NULL;
         }