[PATCH 4/5] xilinx: zynq: fix dfu alt buffer clearing

[Vincent Stehlé]

The set_dfu_alt_info() function calls the ALLOC_CACHE_ALIGN_BUFFER()
macro to declare a `buf' variable pointer into an array allocated on the
stack. It then calls the memset() function to clear the useable portion
of the array using the idiomatic expression `sizeof(buf)'.

While this would indeed work fine for an array, in the present case we
end up clearing only the size of a pointer.
Fix this by specifying the explicit size `DFU_ALT_BUF_LEN' instead.

Fixes: c67fecd2125b ("ARM: zynq: Enable capsule update for qspi and mmc")
Signed-off-by: Vincent Stehlé <vincent.ste...@arm.com>
Cc: Michal Simek <michal.si...@amd.com>
Cc: Tom Rini <tr...@konsulko.com>
---
 board/xilinx/zynq/board.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c
index 8dbfa560423..d8d4d5022ae 100644
--- a/board/xilinx/zynq/board.c
+++ b/board/xilinx/zynq/board.c
@@ -176,7 +176,7 @@ void set_dfu_alt_info(char *interface, char *devstr)
        if (env_get("dfu_alt_info"))
                return;
 
-       memset(buf, 0, sizeof(buf));
+       memset(buf, 0, DFU_ALT_BUF_LEN);
 
        switch ((zynq_slcr_get_boot_mode()) & ZYNQ_BM_MASK) {
 #if defined(CONFIG_SPL_FS_LOAD_PAYLOAD_NAME)
-- 
2.47.2