VFS: VFileFromFD should not open directories

CHANGES

@@ -31,6 +31,7 @@ Bugfixes:
  - GBA BIOS: Fix ArcTan2 accuracy and boundary conditions
  - SDL: Fix sporadic crash when deinitializing audio
  - GBA Audio: Reset audio FIFO DMA if an invalid destination is set
+ - VFS: VFileFromFD should not open directories
 Misc:
  - GBA: Slightly optimize GBAProcessEvents
  - Qt: Add preset for DualShock 4

src/util/vfs/vfs-fd.c

@@ -52,6 +52,12 @@ struct VFile* VFileFromFD(int fd) {
 		return 0;
 	}
 
+	struct stat stat;
+	if (fstat(fd, &stat) < 0 || S_ISDIR(stat.st_mode)) {
+		close(fd);
+		return 0;
+	}
+
 	struct VFileFD* vfd = malloc(sizeof(struct VFileFD));
 	if (!vfd) {
 		return 0;