From 5a57be8d100c67a033ec78f00d5a0cd387da72e9 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 9 Jan 2006 14:52:21 +0100 Subject: [PATCH] [BLOCK] scsi_ioctl: file can be NULL from ioctl_by_bdev() Signed-off-by: Jens Axboe --- block/scsi_ioctl.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index c2ac36dfe4f3..18de84c8ccd8 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -190,16 +190,21 @@ static int verify_command(struct file *file, unsigned char *cmd) safe_for_write(GPCMD_SET_STREAMING), }; unsigned char type = cmd_type[cmd[0]]; + int has_write_perm = 0; /* Anybody who can open the device can do a read-safe command */ if (type & CMD_READ_SAFE) return 0; + /* + * file can be NULL from ioctl_by_bdev()... + */ + if (file) + has_write_perm = file->f_mode & FMODE_WRITE; + /* Write-safe commands just require a writable open.. */ - if (type & CMD_WRITE_SAFE) { - if (file->f_mode & FMODE_WRITE) - return 0; - } + if ((type & CMD_WRITE_SAFE) && has_write_perm) + return 0; /* And root can do any command.. */ if (capable(CAP_SYS_RAWIO))