6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Antonov alexander.antonov@linux.intel.com
[ Upstream commit 1692cf434ba13ee212495b5af795b6a07e986ce4 ]
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: f680b6e6062e ("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.i... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/events/intel/uncore_snbep.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index 8250f0f59c2b..49bc27ab26ad 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -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: