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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 <faiz_abbas@ti.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Faiz Abbas 2019-09-04 20:10:12 +05:30 committed by Tom Rini
parent fd75bf7bfa
commit 7aed3d3809
1 changed files with 2 additions and 1 deletions
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3
disk/part_dos.c
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@ -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;