Alex Henrie : hhctrl: Handle memory allocation failure in GetChmString.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f41214edaabc35a1b774c12345fac3a4136085e1
URL:    https://gitlab.winehq.org/wine/wine/-/commit/f41214edaabc35a1b774c12345fac3a...

Author: Alex Henrie <alexhenrie24(a)gmail.com>
Date:   Mon Nov 21 19:17:52 2022 -0700

hhctrl: Handle memory allocation failure in GetChmString.

---

 dlls/hhctrl.ocx/chm.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/dlls/hhctrl.ocx/chm.c b/dlls/hhctrl.ocx/chm.c
index 3a9a8fa9e7a..aa04a05fa33 100644
--- a/dlls/hhctrl.ocx/chm.c
+++ b/dlls/hhctrl.ocx/chm.c
@@ -32,18 +32,25 @@ WINE_DEFAULT_DEBUG_CHANNEL(htmlhelp);
 static LPCSTR GetChmString(CHMInfo *chm, DWORD offset)
 {
     LPCSTR str;
+    char **new_strings;
 
     if(!chm->strings_stream)
         return NULL;
 
     if(chm->strings_size <= (offset >> BLOCK_BITS)) {
         chm->strings_size = (offset >> BLOCK_BITS)+1;
-        if(chm->strings)
-            chm->strings = heap_realloc_zero(chm->strings,
+        if(chm->strings) {
+            new_strings = heap_realloc_zero(chm->strings,
                     chm->strings_size*sizeof(char*));
-        else
+            if(!new_strings)
+                return NULL;
+            chm->strings = new_strings;
+        }else {
             chm->strings = heap_alloc_zero(
                     chm->strings_size*sizeof(char*));
+            if(!chm->strings)
+                return NULL;
+        }
 
     }