diff options
| -rw-r--r-- | drivers/mtd/mtdchar.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 22ed96c4b7bd..b42553cd9af5 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -483,6 +483,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file, { struct mtd_oob_buf buf; struct mtd_oob_ops ops; + uint32_t retlen; if(!(file->f_mode & 2)) return -EPERM; @@ -522,8 +523,11 @@ static int mtd_ioctl(struct inode *inode, struct file *file, buf.start &= ~(mtd->oobsize - 1); ret = mtd->write_oob(mtd, buf.start, &ops); - if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen, - sizeof(uint32_t))) + if (ops.oobretlen > 0xFFFFFFFFU) + ret = -EOVERFLOW; + retlen = ops.oobretlen; + if (copy_to_user(&((struct mtd_oob_buf *)argp)->length, + &retlen, sizeof(buf.length))) ret = -EFAULT; kfree(ops.oobbuf); |