5bdfa85401
Non-IB devices do not have a umad interface and the client_data will be
left set to NULL. In this case calling get_nl_info() will try to kref a
NULL cdev causing a crash:
general protection fault, probably for non-canonical address 0xdffffc00000000ba: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005d0-0x00000000000005d7]
CPU: 0 PID: 20851 Comm: syz-executor.0 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kobject_get+0x35/0x150 lib/kobject.c:640
Code: 53 e8 3f b0 8b f9 4d 85 e4 0f 84 a2 00 00 00 e8 31 b0 8b f9 49 8d 7c 24 3c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f b6 04 02 48 89 fa
+83 e2 07 38 d0 7f 08 84 c0 0f 85 eb 00 00 00
RSP: 0018:ffffc9000946f1a0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffffffff85bdbbb0 RCX: ffffc9000bf22000
RDX: 00000000000000ba RSI: ffffffff87e9d78f RDI: 00000000000005d4
RBP: ffffc9000946f1b8 R08: ffff8880581a6440 R09: ffff8880581a6cd0
R10: fffffbfff154b838 R11: ffffffff8aa5c1c7 R12: 0000000000000598
R13: 0000000000000000 R14: ffffc9000946f278 R15: ffff88805cb0c4d0
FS: 00007faa9e8af700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30121000 CR3: 000000004515d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
get_device+0x25/0x40 drivers/base/core.c:2574
__ib_get_client_nl_info+0x205/0x2e0 drivers/infiniband/core/device.c:1861
ib_get_client_nl_info+0x35/0x180 drivers/infiniband/core/device.c:1881
nldev_get_chardev+0x575/0xac0 drivers/infiniband/core/nldev.c:1621
rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline]
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x5d9/0x980 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:672
____sys_sendmsg+0x753/0x880 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0x105/0x1d0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Cc: stable@kernel.org
Fixes:
|
||
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.