linux-kernel - [PATCH 2/4] hpsa: don't bother with vmalloc for BIG_IOCTL_Command

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Message-Id: <20200529234028.46373-2-viro@ZenIV.linux.org.uk>
Date:   Sat, 30 May 2020 00:40:26 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Don Brace <don.brace@...rosemi.com>, linux-scsi@...r.kernel.org
Subject: [PATCH 2/4] hpsa: don't bother with vmalloc for BIG_IOCTL_Command_struct

From: Al Viro <viro@...iv.linux.org.uk>

"BIG" in the name refers to the amount of data being transferred,
_not_ the size of structure itself; it's 140 or 144 bytes (for
32bit and 64bit hosts resp.).  IOCTL_Command_struct is 136 or
144 bytes large...

No point whatsoever turning that into dynamic allocation, let
alone vmalloc one.  Just keep it as local variable...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/scsi/hpsa.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 3344a06c938e..64fd97272109 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6619,21 +6619,17 @@ static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd,
 		return rc;
 	}
 	case CCISS_BIG_PASSTHRU: {
-		BIG_IOCTL_Command_struct *ioc;
+		BIG_IOCTL_Command_struct ioc;
 		if (!argp)
 			return -EINVAL;
+		if (copy_from_user(&ioc, argp, sizeof(ioc)))
+			return -EFAULT;
 		if (atomic_dec_if_positive(&h->passthru_cmds_avail) < 0)
 			return -EAGAIN;
-		ioc = vmemdup_user(argp, sizeof(*ioc));
-		if (IS_ERR(ioc)) {
-			atomic_inc(&h->passthru_cmds_avail);
-			return PTR_ERR(ioc);
-		}
-		rc = hpsa_big_passthru_ioctl(h, ioc);
+		rc = hpsa_big_passthru_ioctl(h, &ioc);
 		atomic_inc(&h->passthru_cmds_avail);
-		if (!rc && copy_to_user(argp, ioc, sizeof(*ioc)))
+		if (!rc && copy_to_user(argp, &ioc, sizeof(ioc)))
 			rc = -EFAULT;
-		kvfree(ioc);
 		return rc;
 	}
 	default:
-- 
2.11.0