Matteo Bruni : user32: Don't go past the end of the animated cursor data.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: aaecc404642877074550ff1c156c32bc9888da74
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=aaecc404642877074550ff1c1...

Author: Matteo Bruni <mbruni(a)codeweavers.com>
Date:   Mon Sep 30 23:11:14 2019 +0200

user32: Don't go past the end of the animated cursor data.

Signed-off-by: Matteo Bruni <mbruni(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/user32/cursoricon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/user32/cursoricon.c b/dlls/user32/cursoricon.c
index 3214746664..9c61d7ff30 100644
--- a/dlls/user32/cursoricon.c
+++ b/dlls/user32/cursoricon.c
@@ -1451,6 +1451,8 @@ static void riff_find_chunk( DWORD chunk_id, DWORD chunk_type, const riff_chunk_
         }
 
         ptr += sizeof(DWORD);
+        if (ptr >= end)
+            break;
         ptr += (*(const DWORD *)ptr + 1) & ~1;
         ptr += sizeof(DWORD);
     }