netdevsim: fix uninitialized data in nsim_dev_trap_fa_cookie_write()

The simple_write_to_buffer() function is designed to handle partial
writes.  It returns negatives on error, otherwise it returns the number
of bytes that were able to be copied.  This code doesn't check the
return properly.  We only know that the first byte is written, the rest
of the buffer might be uninitialized.

There is no need to use the simple_write_to_buffer() function.
Partial writes are prohibited by the "if (*ppos != 0)" check at the
start of the function.  Just use memdup_user() and copy the whole
buffer.

Fixes: d3cbb907ae57 ("netdevsim: add ACL trap reporting cookie as a metadata")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/7c1f950b-3a7d-4252-82a6-876e53078ef7@moroto.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 6045bece2654d69ab7af7fffd787c271caaa6d26..b4d3b9cde8bd685202f135cf9c845d1be76ef428 100644 (file)
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -184,13 +184,10 @@ static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file,
        cookie_len = (count - 1) / 2;
        if ((count - 1) % 2)
                return -EINVAL;
-       buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
-       if (!buf)
-               return -ENOMEM;
 
-       ret = simple_write_to_buffer(buf, count, ppos, data, count);
-       if (ret < 0)
-               goto free_buf;
+       buf = memdup_user(data, count);
+       if (IS_ERR(buf))
+               return PTR_ERR(buf);
 
        fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
                            GFP_KERNEL | __GFP_NOWARN);