fsstress: fix memory leak in do_aio_rw

If io_submit or io_getevents fails, the do_aio_rw() won't free the
"buf" and cause memory leak.

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

ltp/fsstress.c

@@ -2078,11 +2078,11 @@ void
 do_aio_rw(int opno, long r, int flags)
 {
 	int64_t		align;
-	char		*buf;
+	char		*buf = NULL;
 	struct dioattr	diob;
 	int		e;
 	pathname_t	f;
-	int		fd;
+	int		fd = -1;
 	size_t		len;
 	int64_t		lr;
 	off64_t		off;
@@ -2099,8 +2099,7 @@ do_aio_rw(int opno, long r, int flags)
 	if (!get_fname(FT_REGFILE, r, &f, NULL, NULL, &v)) {
 		if (v)
 			printf("%d/%d: do_aio_rw - no filename\n", procid, opno);
-		free_pathname(&f);
+		goto aio_out;
-		return;
 	}
 	fd = open_path(&f, flags|O_DIRECT);
 	e = fd < 0 ? errno : 0;
@@ -2109,25 +2108,20 @@ do_aio_rw(int opno, long r, int flags)
 		if (v)
 			printf("%d/%d: do_aio_rw - open %s failed %d\n",
 			       procid, opno, f.path, e);
-		free_pathname(&f);
+		goto aio_out;
-		return;
 	}
 	if (fstat64(fd, &stb) < 0) {
 		if (v)
 			printf("%d/%d: do_aio_rw - fstat64 %s failed %d\n",
 			       procid, opno, f.path, errno);
-		free_pathname(&f);
+		goto aio_out;
-		close(fd);
-		return;
 	}
 	inode_info(st, sizeof(st), &stb, v);
 	if (!iswrite && stb.st_size == 0) {
 		if (v)
 			printf("%d/%d: do_aio_rw - %s%s zero size\n", procid, opno,
 			       f.path, st);
-		free_pathname(&f);
+		goto aio_out;
-		close(fd);
-		return;
 	}
 	if (xfsctl(f.path, fd, XFS_IOC_DIOINFO, &diob) < 0) {
 		if (v)
@@ -2150,6 +2144,12 @@ do_aio_rw(int opno, long r, int flags)
 	else if (len > diob.d_maxiosz)
 		len = diob.d_maxiosz;
 	buf = memalign(diob.d_mem, len);
+	if (!buf) {
+		if (v)
+			printf("%d/%d: do_aio_rw - memalign failed\n",
+			       procid, opno);
+		goto aio_out;
+	}
 
 	if (iswrite) {
 		off = (off64_t)(lr % MIN(stb.st_size + (1024 * 1024), MAXFSIZE));
@@ -2166,27 +2166,26 @@ do_aio_rw(int opno, long r, int flags)
 		if (v)
 			printf("%d/%d: %s - io_submit failed %d\n",
 			       procid, opno, iswrite ? "awrite" : "aread", e);
-		free_pathname(&f);
+		goto aio_out;
-		close(fd);
-		return;
 	}
 	if ((e = io_getevents(io_ctx, 1, 1, &event, NULL)) != 1) {
 		if (v)
 			printf("%d/%d: %s - io_getevents failed %d\n",
 			       procid, opno, iswrite ? "awrite" : "aread", e);
-		free_pathname(&f);
+		goto aio_out;
-		close(fd);
-		return;
 	}
 
 	e = event.res != len ? event.res2 : 0;
-	free(buf);
 	if (v)
 		printf("%d/%d: %s %s%s [%lld,%d] %d\n",
 		       procid, opno, iswrite ? "awrite" : "aread",
 		       f.path, st, (long long)off, (int)len, e);
+ aio_out:
+	if (buf)
+		free(buf);
+	if (fd != -1)
+		close(fd);
 	free_pathname(&f);
-	close(fd);
 }
 #endif