winmm: Fixed boundary condition in mmioOpen file name parsing.

4431c32c · Alexander Puzankov · Alexandre Julliard · e75635a7 · 4431c32c
Commit 4431c32c authored Dec 05, 2010 by Alexander Puzankov Committed by Alexandre Julliard Dec 05, 2010
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mmio.c dlls/winmm/mmio.c +5 -5

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--- a/dlls/winmm/mmio.c
+++ b/dlls/winmm/mmio.c
@@ -399,13 +399,13 @@ static FOURCC MMIO_ParseExtA(LPCSTR szFileName)
    } else {
        /* Find the first '.' before '+' */
        extStart = extEnd - 1;
-        while (*extStart != '.') {
-            if (extStart == szFileName) {
-                ERR("No extension in szFileName: %s\n", debugstr_a(szFileName));
-                return ret;
-            }
+        while (extStart >= szFileName && *extStart != '.') {
            extStart--;
        }
+        if (extStart < szFileName) {
+            ERR("No extension in szFileName: %s\n", debugstr_a(szFileName));
+            return ret;
+        }
    }

    if (extEnd - extStart - 1 > 4)