1 files changed, 64 insertions, 0 deletions
diff --git a/backport-Fix-invalid-pointer-dereference-in-wcscpy_chk.patch b/backport-Fix-invalid-pointer-dereference-in-wcscpy_chk.patch
new file mode 100644
index 0000000..1a3bec1
--- /dev/null
+++ b/backport-Fix-invalid-pointer-dereference-in-wcscpy_chk.patch
@@ -0,0 +1,64 @@
+From 1527ac4626b4bf1bcc46203481003a7f33e2aca5 Mon Sep 17 00:00:00 2001
+From: Szabolcs Nagy <szabolcs.nagy@arm.com>
+Date: Tue, 21 Jun 2022 14:43:30 +0100
+Subject: [PATCH] Fix invalid pointer dereference in wcscpy_chk
+
+The src pointer is const and points to a different object, so accessing
+dest via src is invalid.
+
+Reviewed-by: Florian Weimer <fweimer@redhat.com>
+---
+ debug/wcscpy_chk.c | 34 +++++++---------------------------
+ 1 file changed, 7 insertions(+), 27 deletions(-)
+
+diff --git a/debug/wcscpy_chk.c b/debug/wcscpy_chk.c
+index dfe475da..8115b00e 100644
+--- a/debug/wcscpy_chk.c
++++ b/debug/wcscpy_chk.c
+@@ -25,36 +25,16 @@ wchar_t *
+ __wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n)
+ {
+   wint_t c;
+-  wchar_t *wcp;
++  wchar_t *wcp = dest;
+ 
+-  if (__alignof__ (wchar_t) >= sizeof (wchar_t))
++  do
+     {
+-      const ptrdiff_t off = dest - src - 1;
+-
+-      wcp = (wchar_t *) src;
+-
+-      do
+-	{
+-	  if (__glibc_unlikely (n-- == 0))
+-	    __chk_fail ();
+-	  c = *wcp++;
+-	  wcp[off] = c;
+-	}
+-      while (c != L'\0');
+-    }
+-  else
+-    {
+-      wcp = dest;
+-
+-      do
+-	{
+-	  if (__glibc_unlikely (n-- == 0))
+-	    __chk_fail ();
+-	  c = *src++;
+-	  *wcp++ = c;
+-	}
+-      while (c != L'\0');
++      if (__glibc_unlikely (n-- == 0))
++        __chk_fail ();
++      c = *src++;
++      *wcp++ = c;
+     }
++  while (c != L'\0');
+ 
+   return dest;
+ }
+-- 
+2.27.0
+