Alex Henrie : hhctrl: Handle memory allocation failure in ReadChmSystem (cppcheck).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 88a5c64b9369baa592163e3cdafe1570a17fcabc
URL:    https://gitlab.winehq.org/wine/wine/-/commit/88a5c64b9369baa592163e3cdafe157...

Author: Alex Henrie <alexhenrie24(a)gmail.com>
Date:   Sun Dec 11 22:15:04 2022 -0700

hhctrl: Handle memory allocation failure in ReadChmSystem (cppcheck).

---

 dlls/hhctrl.ocx/chm.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/dlls/hhctrl.ocx/chm.c b/dlls/hhctrl.ocx/chm.c
index fb982303a3c..4be86bd165a 100644
--- a/dlls/hhctrl.ocx/chm.c
+++ b/dlls/hhctrl.ocx/chm.c
@@ -82,7 +82,7 @@ static BOOL ReadChmSystem(CHMInfo *chm)
 {
     IStream *stream;
     DWORD ver=0xdeadbeef, read, buf_size;
-    char *buf;
+    char *buf, *new_buf;
     HRESULT hres;
 
     struct {
@@ -101,16 +101,27 @@ static BOOL ReadChmSystem(CHMInfo *chm)
     IStream_Read(stream, &ver, sizeof(ver), &read);
     TRACE("version is %lx\n", ver);
 
-    buf = malloc(8 * sizeof(DWORD));
-    buf_size = 8*sizeof(DWORD);
+    buf_size = 8 * sizeof(DWORD);
+    buf = malloc(buf_size);
+    if(!buf) {
+        IStream_Release(stream);
+        return FALSE;
+    }
 
     while(1) {
         hres = IStream_Read(stream, &entry, sizeof(entry), &read);
         if(hres != S_OK)
             break;
 
-        if(entry.len > buf_size)
-            buf = realloc(buf, buf_size=entry.len);
+        if(entry.len > buf_size) {
+            new_buf = realloc(buf, entry.len);
+            if(!new_buf) {
+                hres = E_OUTOFMEMORY;
+                break;
+            }
+            buf = new_buf;
+            buf_size = entry.len;
+        }
 
         hres = IStream_Read(stream, buf, entry.len, &read);
         if(hres != S_OK)