grub2/grub2-msdos-fix-overflow.patch

47 lines
1.8 KiB
Diff

Index: grub-2.02/grub-core/partmap/msdos.c
===================================================================
--- grub-2.02.orig/grub-core/partmap/msdos.c
+++ grub-2.02/grub-core/partmap/msdos.c
@@ -175,9 +175,9 @@ grub_partition_msdos_iterate (grub_disk_
e = mbr.entries + p.index;
p.start = p.offset
- + (grub_le_to_cpu32 (e->start)
+ + ((grub_disk_addr_t)grub_le_to_cpu32 (e->start)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)) - delta;
- p.len = grub_le_to_cpu32 (e->length)
+ p.len = (grub_uint64_t)grub_le_to_cpu32 (e->length)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
p.msdostype = e->type;
@@ -217,7 +217,7 @@ grub_partition_msdos_iterate (grub_disk_
if (grub_msdos_partition_is_extended (e->type))
{
p.offset = ext_offset
- + (grub_le_to_cpu32 (e->start)
+ + ((grub_disk_addr_t)grub_le_to_cpu32 (e->start)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
if (! ext_offset)
ext_offset = p.offset;
@@ -301,9 +301,9 @@ pc_partition_map_embed (struct grub_disk
if (!grub_msdos_partition_is_empty (e->type)
&& end > offset
- + (grub_le_to_cpu32 (e->start)
+ + ((grub_disk_addr_t)grub_le_to_cpu32 (e->start)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)))
- end = offset + (grub_le_to_cpu32 (e->start)
+ end = offset + ((grub_disk_addr_t)grub_le_to_cpu32 (e->start)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
/* If this is a GPT partition, this MBR is just a dummy. */
@@ -319,7 +319,7 @@ pc_partition_map_embed (struct grub_disk
if (grub_msdos_partition_is_extended (e->type))
{
offset = ext_offset
- + (grub_le_to_cpu32 (e->start)
+ + ((grub_disk_addr_t)grub_le_to_cpu32 (e->start)
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
if (! ext_offset)
ext_offset = offset;