From 7aed3d380981565b5bb2810d5d13aad1ff994f1a Mon Sep 17 00:00:00 2001 From: Faiz Abbas Date: Wed, 4 Sep 2019 20:10:12 +0530 Subject: [PATCH] disk: part_dos: Allocate at least one block size for mbr The blk_dread() following the mbr allocation reads one block from the device. This will lead to overflow if block size is greater than the size of legacy_mbr. Fix this by allocating at least one block size. Signed-off-by: Faiz Abbas Acked-by: Alexey Brodkin --- disk/part_dos.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/disk/part_dos.c b/disk/part_dos.c index aae9d95906..8ddc13b50c 100644 --- a/disk/part_dos.c +++ b/disk/part_dos.c @@ -93,7 +93,8 @@ static int test_block_type(unsigned char *buffer) static int part_test_dos(struct blk_desc *dev_desc) { #ifndef CONFIG_SPL_BUILD - ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1); + ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, + DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr))); if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) return -1; -- 2.39.5