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path: root/drivers/mtd/mtdchar.c
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Diffstat (limited to 'drivers/mtd/mtdchar.c')
-rw-r--r--drivers/mtd/mtdchar.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index a0cee86464ca..5d3ac512ce16 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -481,6 +481,7 @@ 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;
@@ -520,8 +521,11 @@ 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);
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