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perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill_topology() 

[ Upstream commit 1692cf434b ]

Get logical socket id instead of physical id in discover_upi_topology()
to avoid out-of-bound access on 'upi = &type->topology[nid][idx];' line
that leads to NULL pointer dereference in upi_fill_topology()

Fixes: f680b6e606 ("perf/x86/intel/uncore: Enable UPI topology discovery for Icelake Server")
Reported-by: Kyle Meyer <kyle.meyer@hpe.com>
Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Kyle Meyer <kyle.meyer@hpe.com>
Link: https://lore.kernel.org/r/20231127185246.2371939-2-alexander.antonov@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Antonov 2023-11-27 10:52:45 -08:00 committed by Greg Kroah-Hartman
parent 20c0981478
commit bf1bf09e6b
1 changed files with 8 additions and 2 deletions
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10
arch/x86/events/intel/uncore_snbep.c
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@ -5596,7 +5596,7 @@ static int discover_upi_topology(struct intel_uncore_type *type, int ubox_did, i
struct pci_dev *ubox = NULL;
struct pci_dev *dev = NULL;
u32 nid, gid;
int i, idx, ret = -EPERM;
int i, idx, lgc_pkg, ret = -EPERM;
struct intel_uncore_topology *upi;
unsigned int devfn;
@ -5614,8 +5614,13 @@ static int discover_upi_topology(struct intel_uncore_type *type, int ubox_did, i
for (i = 0; i < 8; i++) {
if (nid != GIDNIDMAP(gid, i))
continue;
lgc_pkg = topology_phys_to_logical_pkg(i);
if (lgc_pkg < 0) {
ret = -EPERM;
goto err;
}
for (idx = 0; idx < type->num_boxes; idx++) {
upi = &type->topology[nid][idx];
upi = &type->topology[lgc_pkg][idx];
devfn = PCI_DEVFN(dev_link0 + idx, ICX_UPI_REGS_ADDR_FUNCTION);
dev = pci_get_domain_bus_and_slot(pci_domain_nr(ubox->bus),
ubox->bus->number,
@ -5626,6 +5631,7 @@ static int discover_upi_topology(struct intel_uncore_type *type, int ubox_did, i
goto err;
}
}
break;
}
}
err: