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2c402bd2e8
The cxl_test unit test environment on qemu always hits below call trace
with KASAN enabled:
BUG: KASAN: slab-out-of-bounds in cxl_setup_parent_dport+0x480/0x530 [cxl_core]
Read of size 1 at addr ff110000676014f8 by task (udev-worker)/676[ 24.424403] CPU: 2 PID: 676 Comm: (udev-worker) Tainted: G O N 6.10.0-qemucxl #1
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20240214-2.el9 02/14/2024
Call Trace:
<TASK>
dump_stack_lvl+0xea/0x150
print_report+0xce/0x610
? kasan_complete_mode_report_info+0x40/0x200
kasan_report+0xcc/0x110
__asan_report_load1_noabort+0x18/0x20
cxl_setup_parent_dport+0x480/0x530 [cxl_core]
cxl_mem_probe+0x49b/0xaa0 [cxl_mem]
cxl_test module models a CXL topology for testing, it creates some
emulated dports with platform devices in the CXL topology, so the
dport_dev of an emulated dport points to a platform device rather than a
pci device or a pci host bridge in the case. Currently,
cxl_setup_parent_dport() is used to set up RAS and AER capability on the
dport connected to the CXL memory device, but cxl_test does not support
RAS or AER functionality yet, so the fix is implementing a
__wrap_cxl_setup_parent_dport() to filter out all emulated dports,
guarantees only real dports can be handled by cxl_setup_parent_dport().
Fixes:
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Linux kernel
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