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Message-ID: <20121025141133.30303.3712.stgit@bob.linux.org.uk>
Date: Thu, 25 Oct 2012 15:12:13 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: smain@...ron.com, linux-kernel@...r.kernel.org
Subject: [PATCH RESEND] mtip32xx: fix potential crash on SEC_ERASE_UNIT
(Resending to the list as the maintainer is not responding to direct email)
From: Alan Cox <alan@...ux.intel.com>
The mtip driver lifted this code from elsewhere and then added a special
handling check for SEC_ERASE_UNIT. If the caller tries to do a security
erase but passes no output data for the command then outbuf is not
allocated and the driver duly explodes.
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/block/mtip32xx/mtip32xx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index adc6f36..d11e9e7 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2218,8 +2218,8 @@ static int exec_drive_taskfile(struct driver_data *dd,
fis.device);
/* check for erase mode support during secure erase.*/
- if ((fis.command == ATA_CMD_SEC_ERASE_UNIT)
- && (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
+ if (fis.command == ATA_CMD_SEC_ERASE_UNIT && outbuf &&
+ (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
erasemode = 1;
}
--
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