From: Roland Dreier <rdreier@cisco.com>
Date: Tue, 4 Nov 2008 18:34:48 +0000 (-0800)
Subject: libata: Avoid overflow in ata_tf_read_block() when tf->hba_lbal > 127
X-Git-Tag: v2.6.28-rc5~88^2~1
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=44901a96847b9967c057832b185e2f34ee6a14e5;p=linux-2.6-omap-h63xx.git

libata: Avoid overflow in ata_tf_read_block() when tf->hba_lbal > 127

Phillip O'Donnell <phillip.odonnell@gmail.com> pointed out that the same
sign extension bug that was fixed in commit ba14a9c2 ("libata: Avoid
overflow in ata_tf_to_lba48() when tf->hba_lbal > 127") also appears to
exist in ata_tf_read_block().  Fix this by adding a cast to u64.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 0cd3ad49713..4214bfb13bb 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -612,7 +612,7 @@ u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
 		if (tf->flags & ATA_TFLAG_LBA48) {
 			block |= (u64)tf->hob_lbah << 40;
 			block |= (u64)tf->hob_lbam << 32;
-			block |= tf->hob_lbal << 24;
+			block |= (u64)tf->hob_lbal << 24;
 		} else
 			block |= (tf->device & 0xf) << 24;