linux-kernel - [59/98] libata: Fix accesses at LBA28 boundary (old bug, but nasty) (v2)

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Date:	Mon, 10 May 2010 15:35:11 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Mark Lord <mlord@...ox.com>, Jeff Garzik <jgarzik@...hat.com>
Subject: [59/98] libata: Fix accesses at LBA28 boundary (old bug, but nasty) (v2)

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

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

From: Mark Lord <kernel@...savvy.com>

commit 45c4d015a92f72ec47acd0c7557abdc0c8a6499d upstream.

Most drives from Seagate, Hitachi, and possibly other brands,
do not allow LBA28 access to sector number 0x0fffffff (2^28 - 1).
So instead use LBA48 for such accesses.

This bug could bite a lot of systems, especially when the user has
taken care to align partitions to 4KB boundaries. On misaligned systems,
it is less likely to be encountered, since a 4KB read would end at
0x10000000 rather than at 0x0fffffff.

Signed-off-by: Mark Lord <mlord@...ox.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 include/linux/ata.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -1000,8 +1000,8 @@ static inline int ata_ok(u8 status)
 
 static inline int lba_28_ok(u64 block, u32 n_block)
 {
-	/* check the ending block number */
-	return ((block + n_block) < ((u64)1 << 28)) && (n_block <= 256);
+	/* check the ending block number: must be LESS THAN 0x0fffffff */
+	return ((block + n_block) < ((1 << 28) - 1)) && (n_block <= 256);
 }
 
 static inline int lba_48_ok(u64 block, u32 n_block)


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