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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-04-18 12:51:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 07:45:30 +0200 |
| commit | 8e8a40578fac765527a5d55d258a2ca93904ed1b (patch) | |
| tree | b080b291c29f07432edd19bd33df820d31587221 | |
| parent | 2127751e26b0021638a3597ff302e177cdb861f9 (diff) | |
| download | linux-stable-8e8a40578fac765527a5d55d258a2ca93904ed1b.tar.gz linux-stable-8e8a40578fac765527a5d55d258a2ca93904ed1b.tar.bz2 linux-stable-8e8a40578fac765527a5d55d258a2ca93904ed1b.zip | |
cdrom: information leak in cdrom_ioctl_media_changed()
commit 9de4ee40547fd315d4a0ed1dd15a2fa3559ad707 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>
| -rw-r--r-- | drivers/cdrom/cdrom.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index 5d28a45d2960..3922ce87c2e4 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -2357,7 +2357,7 @@ 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); |