[OE-core][scarthgap][PATCH 3/4] wget: Fix CVE-2026-58471

["Hetvi Thakar -X (hthakar - E INFOCHIPS PRIVATE LIMITED at Cisco)" <hthakar@cisco.com>]

From: Hetvi Thakar <hthakar@cisco.com>

This patch applies the upstream fix as referenced in [2],
using the commit shown in [1].

[1] https://gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee
[2] https://nvd.nist.gov/vuln/detail/CVE-2026-58471

Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
---
 .../wget/wget/CVE-2026-58471.patch            | 71 +++++++++++++++++++
 meta/recipes-extended/wget/wget_1.21.4.bb     |  1 +
 2 files changed, 72 insertions(+)
 create mode 100644 meta/recipes-extended/wget/wget/CVE-2026-58471.patch

diff --git a/meta/recipes-extended/wget/wget/CVE-2026-58471.patch b/meta/recipes-extended/wget/wget/CVE-2026-58471.patch
new file mode 100644
index 0000000000..4938e6761a
--- /dev/null
+++ b/meta/recipes-extended/wget/wget/CVE-2026-58471.patch
@@ -0,0 +1,71 @@
+From f419222cc7e02dea2da104b4fb5a997019bab9a9 Mon Sep 17 00:00:00 2001
+From: Arkadi Vainbrand <arkadva8@gmail.com>
+Date: Tue, 13 Jan 2026 12:22:04 +0200
+Subject: [PATCH] Fix buffer size handling in filename conversion
+
+* src/url.c (convert_fname): Fix buffer overflow.
+
+Copyright-paperwork-exempt: Yes
+
+CVE: CVE-2026-58471
+Upstream-Status: Backport [https://gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee]
+
+Signed-off-by: Arkadi Vainbrand <arkadva8@gmail.com>
+(cherry picked from commit c2640fe5171c59f87c58dc9fcb195b2d18b010ee)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ src/url.c | 20 +++++++++++++-------
+ 1 file changed, 13 insertions(+), 7 deletions(-)
+
+diff --git a/src/url.c b/src/url.c
+index 68688256..6a9efe88 100644
+--- a/src/url.c
++++ b/src/url.c
+@@ -1603,7 +1603,7 @@ convert_fname (char *fname)
+   const char *from_encoding = opt.encoding_remote;
+   const char *to_encoding = opt.locale;
+   iconv_t cd;
+-  size_t len, done, inlen, outlen;
++  size_t len, inlen, outlen;
+   char *s;
+   const char *orig_fname;
+ 
+@@ -1625,7 +1625,6 @@ convert_fname (char *fname)
+   inlen = strlen (fname);
+   len = outlen = inlen * 2;
+   converted_fname = s = xmalloc (outlen + 1);
+-  done = 0;
+ 
+   for (;;)
+     {
+@@ -1633,7 +1632,7 @@ convert_fname (char *fname)
+       if (iconv (cd, (ICONV_CONST char **) &fname, &inlen, &s, &outlen) == 0
+           && iconv (cd, NULL, NULL, &s, &outlen) == 0)
+         {
+-          *(converted_fname + len - outlen - done) = '\0';
++          *s = '\0';
+           iconv_close (cd);
+           DEBUGP (("Converted file name '%s' (%s) -> '%s' (%s)\n",
+                    orig_fname, from_encoding, converted_fname, to_encoding));
+@@ -1656,10 +1655,17 @@ convert_fname (char *fname)
+         }
+       else if (errno == E2BIG) /* Output buffer full */
+         {
+-          done = len;
+-          len = outlen = done + inlen * 2;
+-          converted_fname = xrealloc (converted_fname, outlen + 1);
+-          s = converted_fname + done;
++          size_t used = s - converted_fname;
++          size_t newlen = used + inlen * 2 + 1;
++
++          /* Ensure we actually grow the buffer */
++          if (newlen <= len)
++            newlen = len * 2;
++
++          converted_fname = xrealloc (converted_fname, newlen + 1);
++          len = newlen;
++          s = converted_fname + used;
++          outlen = len - used;
+         }
+       else /* Weird, we got an unspecified error */
+         {
diff --git a/meta/recipes-extended/wget/wget_1.21.4.bb b/meta/recipes-extended/wget/wget_1.21.4.bb
index 50df38aab1..fa4958a485 100644
--- a/meta/recipes-extended/wget/wget_1.21.4.bb
+++ b/meta/recipes-extended/wget/wget_1.21.4.bb
@@ -6,6 +6,7 @@ SRC_URI = "${GNU_MIRROR}/wget/wget-${PV}.tar.gz \
            file://CVE-2026-58469-regression_p1.patch \
            file://CVE-2026-58469-regression_p2.patch \
            file://CVE-2026-58470.patch \
+           file://CVE-2026-58471.patch \
           "
 
 SRC_URI[sha256sum] = "81542f5cefb8faacc39bbbc6c82ded80e3e4a88505ae72ea51df27525bcde04c"
-- 
2.35.6