filter_kubernetes: tests: Fix a possible buffer overrun

cosmo0920 · cosmo0920 · commit 5fbd345ae5bc · 2026-01-14T17:06:23.000+09:00
Signed-off-by: Hiroshi Hatake &lt;hiroshi@chronosphere.io&gt;
diff --git a/tests/runtime/filter_kubernetes.c b/tests/runtime/filter_kubernetes.c
@@ -86,7 +86,7 @@ static int file_to_buf(const char *path, char **out_buf, size_t *out_size)
         return -1;
     }
 
-    buf = flb_malloc(st.st_size);
+    buf = flb_malloc(st.st_size + 1);
     if (!buf) {
         flb_errno();
         fclose(fp);
@@ -100,6 +100,7 @@ static int file_to_buf(const char *path, char **out_buf, size_t *out_size)
         fclose(fp);
         return -1;
     }
+    buf[st.st_size] = '\0';
 
     fclose(fp);
     *out_buf = buf;

Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ static int file_to_buf(const char path, char out_buf, size_t out_size)`
`86`	`86`	`return -1;`
`87`	`87`	`}`
`88`	`88`
`89`		`- buf = flb_malloc(st.st_size);`
	`89`	`+ buf = flb_malloc(st.st_size + 1);`
`90`	`90`	`if (!buf) {`
`91`	`91`	`flb_errno();`
`92`	`92`	`fclose(fp);`
`@@ -100,6 +100,7 @@ static int file_to_buf(const char path, char out_buf, size_t out_size)`
`100`	`100`	`fclose(fp);`
`101`	`101`	`return -1;`
`102`	`102`	`}`
	`103`	`+ buf[st.st_size] = '\0';`
`103`	`104`
`104`	`105`	`fclose(fp);`
`105`	`106`	`*out_buf = buf;`