net: fujitsu: fix potential null-ptr-deref

mainline inclusion
from mainline-v5.13-rc3
commit 52202be1
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9BGKK
CVE: CVE-2021-47149

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=52202be1cd996cde6e8969a128dc27ee45a7cb5e



--------------------------------

In fmvj18x_get_hwinfo(), if ioremap fails there will be NULL pointer
deref. To fix this, check the return value of ioremap and return -1
to the caller in case of failure.

Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-16-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>