[PATCH v2 19/39] read: Use map_sysmem() with buffers in the read command

[Simon Glass]

The current implementation casts an address to a pointer. Make it more
sandbox-friendly by using map_sysmem().

Rename the variable to 'ptr' since it is a pointer, not an address.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 cmd/read.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/cmd/read.c b/cmd/read.c
index af54bd17654..8e21f004423 100644
--- a/cmd/read.c
+++ b/cmd/read.c
@@ -20,7 +20,7 @@ do_rw(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	struct disk_partition part_info;
 	ulong offset, limit;
 	uint blk, cnt, res;
-	void *addr;
+	void *ptr;
 	int part;
 
 	if (argc != 6) {
@@ -33,7 +33,7 @@ do_rw(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	if (part < 0)
 		return 1;
 
-	addr = map_sysmem(hextoul(argv[3], NULL), 0);
+	ptr = map_sysmem(hextoul(argv[3], NULL), 0);
 	blk = hextoul(argv[4], NULL);
 	cnt = hextoul(argv[5], NULL);
 
@@ -48,13 +48,15 @@ do_rw(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 
 	if (cnt + blk > limit) {
 		printf("%s out of range\n", cmdtp->name);
+		unmap_sysmem(ptr);
 		return 1;
 	}
 
 	if (IS_ENABLED(CONFIG_CMD_WRITE) && !strcmp(cmdtp->name, "write"))
-		res = blk_dwrite(dev_desc, offset + blk, cnt, addr);
+		res = blk_dwrite(dev_desc, offset + blk, cnt, ptr);
 	else
-		res = blk_dread(dev_desc, offset + blk, cnt, addr);
+		res = blk_dread(dev_desc, offset + blk, cnt, ptr);
+	unmap_sysmem(ptr);
 
 	if (res != cnt) {
 		printf("%s error\n", cmdtp->name);
-- 
2.34.1