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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2012-02-06 10:20:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-04 09:49:22 -0800 |
| commit | 3e9d6c33830beee43dc1b94bdbff41109455fa58 (patch) | |
| tree | b1da466fe16d5481ae7f639281c276d4747c944f | |
| parent | d298243d8b3e63554553a729aec6b9e1502ce00d (diff) | |
| download | lwn-3e9d6c33830beee43dc1b94bdbff41109455fa58.tar.gz lwn-3e9d6c33830beee43dc1b94bdbff41109455fa58.zip | |
cdrom: use copy_to_user() without the underscores
commit 822bfa51ce44f2c63c300fdb76dc99c4d5a5ca9f upstream.
"nframes" comes from the user and "nframes * CD_FRAMESIZE_RAW" can wrap
on 32 bit systems. That would have been ok if we used the same wrapped
value for the copy, but we use a shifted value. We should just use the
checked version of copy_to_user() because it's not going to make a
difference to the speed.
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 | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index 59cccc95f8f4..a4592ecd5cb0 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -2057,11 +2057,6 @@ static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf, if (!nr) return -ENOMEM; - if (!access_ok(VERIFY_WRITE, ubuf, nframes * CD_FRAMESIZE_RAW)) { - ret = -EFAULT; - goto out; - } - cgc.data_direction = CGC_DATA_READ; while (nframes > 0) { if (nr > nframes) @@ -2070,7 +2065,7 @@ static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf, ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW); if (ret) break; - if (__copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) { + if (copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) { ret = -EFAULT; break; } @@ -2078,7 +2073,6 @@ static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf, nframes -= nr; lba += nr; } -out: kfree(cgc.buffer); return ret; } |