4.14-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
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
--- drivers/cdrom/cdrom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -2374,7 +2374,7 @@ static int cdrom_ioctl_media_changed(str 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);