fix buffer print ub

thevishalagarwal · thevishalagarwal · commit 179dade62be7 · 2025-04-26T02:49:15.000+05:30
diff --git a/examples/llama-bench/llama-bench.cpp b/examples/llama-bench/llama-bench.cpp
@@ -1384,7 +1384,8 @@ struct markdown_printer : public printer {
                     snprintf(buf, sizeof(buf), "pp%d+tg%d", t.n_prompt, t.n_gen);
                 }
                 if (t.n_depth > 0) {
-                    snprintf(buf, sizeof(buf), "%s @ d%d", buf, t.n_depth);
+                    int len = strlen(buf);
+                    snprintf(buf + len, sizeof(buf) - len, " @ d%d", t.n_depth);
                 }
                 value = buf;
             } else if (field == "t/s") {

Original file line number	Diff line number	Diff line change
`@@ -1384,7 +1384,8 @@ struct markdown_printer : public printer {`
`1384`	`1384`	`snprintf(buf, sizeof(buf), "pp%d+tg%d", t.n_prompt, t.n_gen);`
`1385`	`1385`	`}`
`1386`	`1386`	`if (t.n_depth > 0) {`
`1387`		`- snprintf(buf, sizeof(buf), "%s @ d%d", buf, t.n_depth);`
	`1387`	`+ int len = strlen(buf);`
	`1388`	`+ snprintf(buf + len, sizeof(buf) - len, " @ d%d", t.n_depth);`
`1388`	`1389`	`}`
`1389`	`1390`	`value = buf;`
`1390`	`1391`	`} else if (field == "t/s") {`