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authorArnd Bergmann <arnd@arndb.de>2019-12-09 16:33:16 +0100
committerArnd Bergmann <arnd@arndb.de>2020-01-03 09:33:11 +0100
commitab8bc5417d8cf62a5fc515737b391689573e7fb3 (patch)
tree4101c5e66210bb085e2deae013e12998d7f370e0 /drivers/cdrom
parent8f8f562038c188046d683e2b650f7731739869dd (diff)
downloadlinux-ab8bc5417d8cf62a5fc515737b391689573e7fb3.tar.bz2
compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN
This is the only ioctl command that does not have a proper compat handler. Making the normal implementation do the right thing is actually very simply, so just do that by using an in_compat_syscall() check to avoid the special case in the pkcdvd driver. Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/cdrom')
-rw-r--r--drivers/cdrom/cdrom.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 48095025e588..faca0f346fff 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -3293,9 +3293,10 @@ static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
ret = cdrom_get_last_written(cdi, &last);
if (ret)
return ret;
- if (copy_to_user((long __user *)arg, &last, sizeof(last)))
- return -EFAULT;
- return 0;
+ if (in_compat_syscall())
+ return put_user(last, (__s32 __user *)arg);
+
+ return put_user(last, (long __user *)arg);
}
static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,