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b4d91aeb6e
rdma_nl_rcv_msg() checks to see if it should use the .dump() callback
or the .doit() callback. The check is done with this check:
if (flags & NLM_F_DUMP) ...
The NLM_F_DUMP flag is two bits (NLM_F_ROOT | NLM_F_MATCH).
When an RDMA_NL_LS message (response) is received, the bit used for
indicating an error is the same bit as NLM_F_ROOT.
NLM_F_ROOT == (0x100) == RDMA_NL_LS_F_ERR.
ibacm sends a response with the RDMA_NL_LS_F_ERR bit set if an error
occurs in the service. The current code then misinterprets the
NLM_F_DUMP bit and trys to call the .dump() callback.
If the .dump() callback for the specified request is not available
(which is true for the RDMA_NL_LS messages) the following Oops occurs:
[ 4555.960256] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 4555.969046] IP: (null)
[ 4555.972664] PGD 10543f1067 P4D 10543f1067 PUD 1033f93067 PMD 0
[ 4555.979287] Oops: 0010 [#1] SMP
[ 4555.982809] Modules linked in: rpcrdma ib_isert iscsi_target_mod
target_core_mod ib_iser libiscsi scsi_transport_iscsi ib_ipoib rdma_ucm ib_ucm
ib_uverbs ib_umad rdma_cm ib_cm iw_cm dm_mirror dm_region_hash dm_log dm_mod
dax sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm irqbypass
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel crypto_simd
glue_helper cryptd hfi1 rdmavt iTCO_wdt iTCO_vendor_support ib_core mei_me
lpc_ich pcspkr mei ioatdma sg shpchp i2c_i801 mfd_core wmi ipmi_si ipmi_devintf
ipmi_msghandler acpi_power_meter acpi_pad nfsd auth_rpcgss nfs_acl lockd grace
sunrpc ip_tables ext4 mbcache jbd2 sd_mod mgag200 drm_kms_helper syscopyarea
sysfillrect sysimgblt fb_sys_fops ttm igb ahci crc32c_intel ptp libahci
pps_core drm dca libata i2c_algo_bit i2c_core
[ 4556.061190] CPU: 54 PID: 9841 Comm: ibacm Tainted: G I
4.14.0-rc2+ #6
[ 4556.069667] Hardware name: Intel Corporation S2600WT2/S2600WT2, BIOS
SE5C610.86B.01.01.0008.021120151325 02/11/2015
[ 4556.081339] task: ffff880855f42d00 task.stack: ffffc900246b4000
[ 4556.087967] RIP: 0010: (null)
[ 4556.092166] RSP: 0018:ffffc900246b7bc8 EFLAGS: 00010246
[ 4556.098018] RAX: ffffffff81dbe9e0 RBX: ffff881058bb1000 RCX:
0000000000000000
[ 4556.105997] RDX: 0000000000001100 RSI: ffff881058bb1320 RDI:
ffff881056362000
[ 4556.113984] RBP: ffffc900246b7bf8 R08: 0000000000000ec0 R09:
0000000000001100
[ 4556.121971] R10: ffff8810573a5000 R11: 0000000000000000 R12:
ffff881056362000
[ 4556.129957] R13: 0000000000000ec0 R14: ffff881058bb1320 R15:
0000000000000ec0
[ 4556.137945] FS: 00007fe0ba5a38c0(0000) GS:ffff88105f080000(0000)
knlGS:0000000000000000
[ 4556.147000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4556.153433] CR2: 0000000000000000 CR3: 0000001056f5d003 CR4:
00000000001606e0
[ 4556.161419] Call Trace:
[ 4556.164167] ? netlink_dump+0x12c/0x290
[ 4556.168468] __netlink_dump_start+0x186/0x1f0
[ 4556.173357] rdma_nl_rcv_msg+0x193/0x1b0 [ib_core]
[ 4556.178724] rdma_nl_rcv+0xdc/0x130 [ib_core]
[ 4556.183604] netlink_unicast+0x181/0x240
[ 4556.187998] netlink_sendmsg+0x2c2/0x3b0
[ 4556.192392] sock_sendmsg+0x38/0x50
[ 4556.196299] SYSC_sendto+0x102/0x190
[ 4556.200308] ? __audit_syscall_entry+0xaf/0x100
[ 4556.205387] ? syscall_trace_enter+0x1d0/0x2b0
[ 4556.210366] ? __audit_syscall_exit+0x209/0x290
[ 4556.215442] SyS_sendto+0xe/0x10
[ 4556.219060] do_syscall_64+0x67/0x1b0
[ 4556.223165] entry_SYSCALL64_slow_path+0x25/0x25
[ 4556.228328] RIP: 0033:0x7fe0b9db2a63
[ 4556.232333] RSP: 002b:00007ffc55edc260 EFLAGS: 00000293 ORIG_RAX:
000000000000002c
[ 4556.240808] RAX: ffffffffffffffda RBX: 0000000000000010 RCX:
00007fe0b9db2a63
[ 4556.248796] RDX: 0000000000000010 RSI: 00007ffc55edc280 RDI:
000000000000000d
[ 4556.256782] RBP: 00007ffc55edc670 R08: 00007ffc55edc270 R09:
000000000000000c
[ 4556.265321] R10: 0000000000000000 R11: 0000000000000293 R12:
00007ffc55edc280
[ 4556.273846] R13: 000000000260b400 R14: 000000000000000d R15:
0000000000000001
[ 4556.282368] Code: Bad RIP value.
[ 4556.286629] RIP: (null) RSP: ffffc900246b7bc8
[ 4556.293013] CR2: 0000000000000000
[ 4556.297292] ---[ end trace 8d67abcfd10ec209 ]---
[ 4556.305465] Kernel panic - not syncing: Fatal exception
[ 4556.313786] Kernel Offset: disabled
[ 4556.321563] ---[ end Kernel panic - not syncing: Fatal exception
[ 4556.328960] ------------[ cut here ]------------
Special case RDMA_NL_LS response messages to call the appropriate
callback.
Additionally, make sure that the .dump() callback is not NULL
before calling it.
Fixes:
|
||
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.. | ||
accessibility | ||
acpi | ||
amba | ||
android | ||
ata | ||
atm | ||
auxdisplay | ||
base | ||
bcma | ||
block | ||
bluetooth | ||
bus | ||
cdrom | ||
char | ||
clk | ||
clocksource | ||
connector | ||
cpufreq | ||
cpuidle | ||
crypto | ||
dax | ||
dca | ||
devfreq | ||
dio | ||
dma | ||
dma-buf | ||
edac | ||
eisa | ||
extcon | ||
firewire | ||
firmware | ||
fmc | ||
fpga | ||
fsi | ||
gpio | ||
gpu | ||
hid | ||
hsi | ||
hv | ||
hwmon | ||
hwspinlock | ||
hwtracing | ||
i2c | ||
ide | ||
idle | ||
iio | ||
infiniband | ||
input | ||
iommu | ||
ipack | ||
irqchip | ||
isdn | ||
leds | ||
lightnvm | ||
macintosh | ||
mailbox | ||
mcb | ||
md | ||
media | ||
memory | ||
memstick | ||
message | ||
mfd | ||
misc | ||
mmc | ||
mtd | ||
mux | ||
net | ||
nfc | ||
ntb | ||
nubus | ||
nvdimm | ||
nvme | ||
nvmem | ||
of | ||
oprofile | ||
parisc | ||
parport | ||
pci | ||
pcmcia | ||
perf | ||
phy | ||
pinctrl | ||
platform | ||
pnp | ||
power | ||
powercap | ||
pps | ||
ps3 | ||
ptp | ||
pwm | ||
rapidio | ||
ras | ||
regulator | ||
remoteproc | ||
reset | ||
rpmsg | ||
rtc | ||
s390 | ||
sbus | ||
scsi | ||
sfi | ||
sh | ||
sn | ||
soc | ||
spi | ||
spmi | ||
ssb | ||
staging | ||
target | ||
tc | ||
tee | ||
thermal | ||
thunderbolt | ||
tty | ||
uio | ||
usb | ||
uwb | ||
vfio | ||
vhost | ||
video | ||
virt | ||
virtio | ||
vlynq | ||
vme | ||
w1 | ||
watchdog | ||
xen | ||
zorro | ||
Kconfig | ||
Makefile |