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40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From de37bf80fed16a991a9218ca5fb73008f59cd689 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Mon, 26 Jun 2017 12:35:47 -0400
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Subject: [PATCH 095/105] Fix a btrfs read-before-init bug
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---
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grub-core/fs/btrfs.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
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index 9cffa91fa..cb25b9ddd 100644
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--- a/grub-core/fs/btrfs.c
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+++ b/grub-core/fs/btrfs.c
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@@ -232,10 +232,6 @@ read_sblock (grub_disk_t disk, struct grub_btrfs_superblock *sb)
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for (i = 0; i < ARRAY_SIZE (superblock_sectors); i++)
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{
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struct grub_btrfs_superblock sblock;
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- /* Don't try additional superblocks beyond device size. */
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- if (i && (grub_le_to_cpu64 (sblock.this_device.size)
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- >> GRUB_DISK_SECTOR_BITS) <= superblock_sectors[i])
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- break;
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err = grub_disk_read (disk, superblock_sectors[i], 0,
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sizeof (sblock), &sblock);
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if (err == GRUB_ERR_OUT_OF_RANGE)
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@@ -247,6 +243,11 @@ read_sblock (grub_disk_t disk, struct grub_btrfs_superblock *sb)
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if (i == 0 || grub_le_to_cpu64 (sblock.generation)
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> grub_le_to_cpu64 (sb->generation))
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grub_memcpy (sb, &sblock, sizeof (sblock));
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+
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+ /* Don't try additional superblocks beyond device size. */
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+ if (i && (grub_le_to_cpu64 (sblock.this_device.size)
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+ >> GRUB_DISK_SECTOR_BITS) <= superblock_sectors[i])
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+ break;
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}
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if ((err == GRUB_ERR_OUT_OF_RANGE || !err) && i == 0)
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--
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2.13.0
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