mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-01 06:04:48 -04:00
3282a549cf
The commit686d348476("RDMA/rxe: Remove unnecessary mr testing") causes a kernel crash. If responder get a zero-byte RDMA Read request, qp->resp.mr is not set in check_rkey() (see IBA C9-88). The mr is NULL in this case, and a NULL pointer dereference occurs as shown below. BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 2 PID: 3622 Comm: python3 Kdump: loaded Not tainted 6.1.0-rc3+ #34 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:__rxe_put+0xc/0x60 [rdma_rxe] Code: cc cc cc 31 f6 e8 64 36 1b d3 41 b8 01 00 00 00 44 89 c0 c3 cc cc cc cc 41 89 c0 eb c1 90 0f 1f 44 00 00 41 54 b8 ff ff ff ff <f0> 0f c1 47 10 83 f8 01 74 11 45 31 e4 85 c0 7e 20 44 89 e0 41 5c RSP: 0018:ffffb27bc012ce78 EFLAGS: 00010246 RAX: 00000000ffffffff RBX: ffff9790857b0580 RCX: 0000000000000000 RDX: ffff979080fe145a RSI: 000055560e3e0000 RDI: 0000000000000000 RBP: ffff97909c7dd800 R08: 0000000000000001 R09: e7ce43d97f7bed0f R10: ffff97908b29c300 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff97908b29c300 R15: 0000000000000000 FS: 00007f276f7bd740(0000) GS:ffff9792b5c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000000114230002 CR4: 0000000000060ee0 Call Trace: <IRQ> read_reply+0xda/0x310 [rdma_rxe] rxe_responder+0x82d/0xe50 [rdma_rxe] do_task+0x84/0x170 [rdma_rxe] tasklet_action_common.constprop.0+0xa7/0x120 __do_softirq+0xcb/0x2ac do_softirq+0x63/0x90 </IRQ> Support a NULL mr during read_reply() Fixes:686d348476("RDMA/rxe: Remove unnecessary mr testing") Fixes:b5f9a01fae("RDMA/rxe: Fix mr leak in RESPST_ERR_RNR") Link: https://lore.kernel.org/r/20221209045926.531689-1-matsuda-daisuke@fujitsu.com Link: https://lore.kernel.org/r/20221202145713.13152-1-lizhijian@fujitsu.com Signed-off-by: Daisuke Matsuda <matsuda-daisuke@fujitsu.com> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com> Reviewed-by: Li Zhijian <lizhijian@fujitsu.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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.