From 9f5a8a5d1018c56e5d74db644d739e1be72e6f88 Mon Sep 17 00:00:00 2001
From: Timo Warns <Warns@pre-sense.de>
Date: Fri, 6 May 2011 13:47:35 +0200
Subject: [PATCH] Validate size of EFI GUID partition entries.

commit fa039d5f6b126fbd65eefa05db2f67e44df8f121 upstream.

Otherwise corrupted EFI partition tables can cause total confusion.

Signed-off-by: Timo Warns <warns@pre-sense.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 fs/partitions/efi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
index 9efb2cfe2410..3e0ee124a1b3 100644
--- a/fs/partitions/efi.c
+++ b/fs/partitions/efi.c
@@ -347,6 +347,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
 		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(state, *gpt)))
 		goto fail;
 
-- 
2.39.5