[02/21] Validate size of EFI GUID partition entries.

[Greg KH]

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Timo Warns <Warns@xxxxxxxxxxxx>

commit fa039d5f6b126fbd65eefa05db2f67e44df8f121 upstream.

Otherwise corrupted EFI partition tables can cause total confusion.

Signed-off-by: Timo Warns <warns@xxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/partitions/efi.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -349,6 +349,12 @@ is_gpt_valid(struct block_device *bdev,
 		goto fail;
 	}
 
+	/* Check that sizeof_partition_entry has the correct value */
+	if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
+		pr_debug("GUID Partitition Entry Size check failed.\n");
+		goto fail;
+	}
+
 	if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
 		goto fail;
 


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