From aa82e14bc7e7a3770feb23446d1a843d97213ccf Mon Sep 17 00:00:00 2001
From: default <nobody@localhost>
Date: Sun, 11 Dec 2022 10:33:01 +0100
Subject: [PATCH] Backport from xs.

---
 xs.h         | 3 ++-
 xs_httpd.h   | 4 ++--
 xs_version.h | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/xs.h b/xs.h
index 3758c8d..b1e2cec 100644
--- a/xs.h
+++ b/xs.h
@@ -914,7 +914,8 @@ void *xs_memmem(const char *haystack, int h_size, const char *needle, int n_size
     char *p, *r = NULL;
     int offset = 0;
 
-    while (!r && h_size - offset > n_size && (p = strchr(haystack + offset, *needle))) {
+    while (!r && h_size - offset > n_size &&
+           (p = memchr(haystack + offset, *needle, h_size - offset))) {
         if (memcmp(p, needle, n_size) == 0)
             r = p;
         else
diff --git a/xs_httpd.h b/xs_httpd.h
index 454d786..4dad72a 100644
--- a/xs_httpd.h
+++ b/xs_httpd.h
@@ -131,13 +131,13 @@ d_char *_xs_multipart_form_data(char *payload, int p_size, char *header)
         }
 
         /* find the start of the part content */
-        if ((p = xs_memmem(p, p_size - offset, "\r\n\r\n", 4)) == NULL)
+        if ((p = xs_memmem(p, p_size - (p - payload), "\r\n\r\n", 4)) == NULL)
             break;
 
         p += 4;
 
         /* find the next boundary */
-        if ((q = xs_memmem(p, p_size - offset, boundary, bsz)) == NULL)
+        if ((q = xs_memmem(p, p_size - (p - payload), boundary, bsz)) == NULL)
             break;
 
         po = p - payload;
diff --git a/xs_version.h b/xs_version.h
index 5b9a4cf..802072a 100644
--- a/xs_version.h
+++ b/xs_version.h
@@ -1 +1 @@
-/* 3aa82bc4fc310ec95194602bed88a9767e100350 */
+/* d5a6108812a499a389030a1402ce49f282b4a818 */