mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-05 18:39:59 +00:00
Code Issues Releases Wiki Activity

cdrom: information leak in cdrom_ioctl_media_changed()

Browse source 
commit 9de4ee4054 upstream.

This cast is wrong.  "cdi->capacity" is an int and "arg" is an unsigned
long.  The way the check is written now, if one of the high 32 bits is
set then we could read outside the info->slots[] array.

This bug is pretty old and it predates git.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-04-18 12:51:31 +03:00 committed by Greg Kroah-Hartman
parent f4df47e36a
commit 68c09d548b
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/cdrom/cdrom.c
View file

@ -2374,7 +2374,7 @@ static int cdrom_ioctl_media_changed(struct cdrom_device_info *cdi,
if (!CDROM_CAN(CDC_SELECT_DISC) || arg == CDSL_CURRENT)
return media_changed(cdi, 1);
if ((unsigned int)arg >= cdi->capacity)
if (arg >= cdi->capacity)
return -EINVAL;
info = kmalloc(sizeof(*info), GFP_KERNEL);