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authorDan Carpenter <dan.carpenter@oracle.com>2012-02-06 10:20:45 +0100
committerJens Axboe <axboe@kernel.dk>2012-02-06 10:20:45 +0100
commit822bfa51ce44f2c63c300fdb76dc99c4d5a5ca9f (patch)
treec9eaa4357b5ebca49c47bd5a25beabaa992442aa /drivers/cdrom
parent9fa73472ddbcd3da87d35a7f4566eaaf345f798e (diff)
downloadlinaro-lsk-822bfa51ce44f2c63c300fdb76dc99c4d5a5ca9f.tar.gz
cdrom: use copy_to_user() without the underscores
"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. Cc: stable@vger.kernel.com Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/cdrom')
-rw-r--r--drivers/cdrom/cdrom.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 55eaf474d32..8fefe59f52a 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2119,11 +2119,6 @@ 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)
@@ -2132,7 +2127,7 @@ 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;
}
@@ -2140,7 +2135,6 @@ static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
nframes -= nr;
lba += nr;
}
-out:
kfree(cgc.buffer);
return ret;
}