linux-kernel - [PATCH 5.4 06/92] lp: fix sparc64 LPSETTIMEOUT ioctl

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Message-Id: <20191211150223.378611864@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:04:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 5.4 06/92] lp: fix sparc64 LPSETTIMEOUT ioctl

From: Arnd Bergmann <arnd@...db.de>

commit 45a2d64696b11913bcf1087b041740edbade3e21 upstream.

The layout of struct timeval is different on sparc64 from
anything else, and the patch I did long ago failed to take
this into account.

Change it now to handle sparc64 user space correctly again.

Quite likely nobody cares about parallel ports on sparc64,
but there is no reason not to fix it.

Cc: stable@...r.kernel.org
Fixes: 9a450484089d ("lp: support 64-bit time_t user space")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/r/20191108203435.112759-7-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/char/lp.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -713,6 +713,10 @@ static int lp_set_timeout64(unsigned int
 	if (copy_from_user(karg, arg, sizeof(karg)))
 		return -EFAULT;
 
+	/* sparc64 suseconds_t is 32-bit only */
+	if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
+		karg[1] >>= 32;
+
 	return lp_set_timeout(minor, karg[0], karg[1]);
 }