From: Cursor Agent <cursoragent@cursor.com>
Date: Sat, 4 Oct 2025 12:23:40 +0000 (+0000)
Subject: Fix DKIM: Handle lines with only spaces correctly
X-Git-Tag: 3.13.2~3^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F5662%2Fhead;p=thirdparty%2Frspamd.git

Fix DKIM: Handle lines with only spaces correctly

Co-authored-by: v <v@rspamd.com>
---

diff --git a/src/libserver/dkim.c b/src/libserver/dkim.c
index e9c86125b7..062ebeffc4 100644
--- a/src/libserver/dkim.c
+++ b/src/libserver/dkim.c
@@ -2178,11 +2178,16 @@ rspamd_dkim_skip_empty_lines(struct rspamd_task *task, struct rspamd_dkim_common
 		case test_spaces:
 			t = p - skip;
 
-			while (t >= start + 2 && (*t == ' ' || *t == '\t')) {
+			while (t >= start && (*t == ' ' || *t == '\t')) {
 				t--;
 			}
 
-			if (*t == '\r') {
+			if (t < start) {
+				/* The entire line (or body) is only spaces - treat as empty */
+				p = start - 1;
+				goto end;
+			}
+			else if (*t == '\r') {
 				p = t;
 				state = got_cr;
 			}