2 files changed, 10 insertions, 5 deletions

diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 80eeff5fdfe0..49cfd5f54238 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -262,15 +262,16 @@ static gpt_header *
 alloc_read_gpt_header(struct block_device *bdev, u64 lba)
 {
         gpt_header *gpt;
+        unsigned ssz = bdev_logical_block_size(bdev);
+
         if (!bdev)
                 return NULL;
 
-        gpt = kzalloc(sizeof (gpt_header), GFP_KERNEL);
+        gpt = kzalloc(ssz, GFP_KERNEL);
         if (!gpt)
                 return NULL;
 
-        if (read_lba(bdev, lba, (u8 *) gpt,
-                     sizeof (gpt_header)) < sizeof (gpt_header)) {
+        if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) {
                 kfree(gpt);
                 gpt=NULL;
                 return NULL;
diff --git a/fs/partitions/efi.h b/fs/partitions/efi.h
index 2cc89d0475bf..6998b589abf9 100644
--- a/fs/partitions/efi.h
+++ b/fs/partitions/efi.h
@@ -37,7 +37,6 @@
 #define EFI_PMBR_OSTYPE_EFI 0xEF
 #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
 
-#define GPT_BLOCK_SIZE 512
 #define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
 #define GPT_HEADER_REVISION_V1 0x00010000
 #define GPT_PRIMARY_PARTITION_TABLE_LBA 1
@@ -79,7 +78,12 @@ typedef struct _gpt_header {
         __le32 num_partition_entries;
         __le32 sizeof_partition_entry;
         __le32 partition_entry_array_crc32;
-        u8 reserved2[GPT_BLOCK_SIZE - 92];
+
+        /* The rest of the logical block is reserved by UEFI and must be zero.
+         * EFI standard handles this by:
+         *
+         * uint8_t              reserved2[ BlockSize - 92 ];
+         */
 } __attribute__ ((packed)) gpt_header;
 
 typedef struct _gpt_entry_attributes {