commit 90de04bc7f1b85b9c491bcd124f6178fad005de1
from: Stefan Sperling <stsp@stsp.name>
date: Mon Oct 11 18:32:16 2021 UTC

fix a segfault in edscript() introduced by my previous commit

Found by our cherrypick regression tests.

commit - f10244c07ff073c7f69ecf2044ac34e85f0666a0
commit + 90de04bc7f1b85b9c491bcd124f6178fad005de1
blob - 4619d898de367bdd4a4c3ff090a223135dbb0935
blob + 9b918583a6db04e4fff29bcb04a7490e23db43cc
--- lib/diff3.c
+++ lib/diff3.c
@@ -982,7 +982,7 @@ edscript(int n, struct diff3_state *d3s)
 	off_t len;
 	char *line = NULL;
 	size_t linesize = 0;
-	ssize_t linelen, k;
+	ssize_t linelen = 0, k;
 
 	for (; n > 0; n--) {
 		if (!d3s->overlap[n]) {
@@ -1013,7 +1013,7 @@ edscript(int n, struct diff3_state *d3s)
 					goto done;
 			}
 			err = diff_output(d3s->diffbuf, "%s%s\n",
-			    line[linelen] == '\n' ? ":" : "",
+			    linelen > 0 && line[linelen] == '\n' ? ":" : "",
 			    GOT_DIFF_CONFLICT_MARKER_SEP);
 			if (err)
 				goto done;