The copy_to_user was casting away the address space to get the offset
of the length member. Use offsetof() instead and add it to the void __user *argp.

drivers/mtd/mtdchar.c:527:23: warning: cast removes address space of expression
drivers/mtd/mtdchar.c:527:23: warning: incorrect type in argument 1 (different address spaces)
drivers/mtd/mtdchar.c:527:23: expected void [noderef] *to
drivers/mtd/mtdchar.c:527:23: got unsigned int *

Signed-off-by: Harvey Harrison
drivers/mtd/mtdchar.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 5d3ac51..9c2af46 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;
+ struct mtd_oob_buf __user *user_buf = argp;
uint32_t retlen;

if(!(file->f_mode & 2))
@@ -524,8 +525,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
if (ops.oobretlen > 0xFFFFFFFFU)
retlen = ops.oobretlen;
- if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
- &retlen, sizeof(buf.length)))
+ if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
ret = -EFAULT;


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