[scan_json] handle invalid line when there is a cutoff

tstack · tstack · commit 47c9f9a75ae8 · 2026-03-13T12:24:35.000-07:00
diff --git a/src/log_format.cc b/src/log_format.cc
@@ -1867,7 +1867,7 @@ external_log_format::scan_json(std::vector<logline>& dst,
             line_count = msg_frag.count('\n') + 1;
             yajl_free_error(handle, msg);
         }
-        if (!this->lf_specialized) {
+        if (!this->lf_specialized || dst.empty()) {
             return scan_no_match{"JSON parsing failed"};
         }
         for (int lpc = 0; lpc < line_count; lpc++) {

Original file line number	Diff line number	Diff line change
`@@ -1867,7 +1867,7 @@ external_log_format::scan_json(std::vector<logline>& dst,`
`1867`	`1867`	`line_count = msg_frag.count('\n') + 1;`
`1868`	`1868`	`yajl_free_error(handle, msg);`
`1869`	`1869`	`}`
`1870`		`- if (!this->lf_specialized) {`
	`1870`	`+ if (!this->lf_specialized \|\| dst.empty()) {`
`1871`	`1871`	`return scan_no_match{"JSON parsing failed"};`
`1872`	`1872`	`}`
`1873`	`1873`	`for (int lpc = 0; lpc < line_count; lpc++) {`