From 2eacbd762332795e00692ddab2515c6da23198d3 Mon Sep 17 00:00:00 2001
From: Changqing Li <changqing.li@windriver.com>
Date: Mon, 12 May 2025 14:06:41 +0800
Subject: [PATCH] sniffer: Add better coverage of skip_insignificant_space()

CVE: CVE-2025-2784
Upstream-Status: Backport
[https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/435/diffs?commit_id=242a10fbb12dbdc12d254bd8fc8669a0ac055304;
 https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/442/diffs?commit_id=c415ad0b6771992e66c70edf373566c6e247089d]

Test code is not added since it uses some functions not defined in
version 2.74. These tests are not used now, so just ignore them.

Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
 libsoup/soup-content-sniffer.c |  9 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/libsoup/soup-content-sniffer.c b/libsoup/soup-content-sniffer.c
index 5f2896e..9554636 100644
--- a/libsoup/soup-content-sniffer.c
+++ b/libsoup/soup-content-sniffer.c
@@ -612,8 +612,10 @@ sniff_text_or_binary (SoupContentSniffer *sniffer, SoupBuffer *buffer)
 }
 
 static gboolean
-skip_insignificant_space (const char *resource, int *pos, int resource_length)
+skip_insignificant_space (const char *resource, gsize *pos, gsize resource_length)
 {
+	if (*pos >= resource_length)
+		return TRUE;
 	while ((resource[*pos] == '\x09') ||
 	       (resource[*pos] == '\x20') ||
 	       (resource[*pos] == '\x0A') ||
@@ -632,7 +634,7 @@ sniff_feed_or_html (SoupContentSniffer *sniffer, SoupBuffer *buffer)
 {
 	const char *resource = (const char *)buffer->data;
 	int resource_length = MIN (512, buffer->length);
-	int pos = 0;
+	gsize pos = 0;
 
 	if (resource_length < 3)
 		goto text_html;
@@ -642,9 +644,6 @@ sniff_feed_or_html (SoupContentSniffer *sniffer, SoupBuffer *buffer)
 		pos = 3;
 
  look_for_tag:
-	if (pos > resource_length)
-		goto text_html;
-
 	if (skip_insignificant_space (resource, &pos, resource_length))
 		goto text_html;

-- 
2.34.1

