From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit 77516d25f54912a7baedeeac1b1b828b6f285152 ]
The copy_to_user() function returns the number of bytes remaining but we want to return -EFAULT to the user if it can't complete the copy. The "st" variable only holds zero on success or negative error codes on failure so the type should be int.
Fixes: 36f988e978f8 ("rsxx: Adding in debugfs entries.") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/block/rsxx/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c index 63f549889f87..5ac1881396af 100644 --- a/drivers/block/rsxx/core.c +++ b/drivers/block/rsxx/core.c @@ -165,15 +165,17 @@ static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf, { struct rsxx_cardinfo *card = file_inode(fp)->i_private; char *buf; - ssize_t st; + int st;
buf = kzalloc(cnt, GFP_KERNEL); if (!buf) return -ENOMEM;
st = rsxx_creg_read(card, CREG_ADD_CRAM + (u32)*ppos, cnt, buf, 1); - if (!st) - st = copy_to_user(ubuf, buf, cnt); + if (!st) { + if (copy_to_user(ubuf, buf, cnt)) + st = -EFAULT; + } kfree(buf); if (st) return st;