6.6-stable review patch. If anyone has any objections, please let me know.
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From: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com
commit 685f88c72a0c4d12d3bd2ff50286938f14486f85 upstream.
Address a Smatch static checker warning regarding an unchecked dereference in the function call: set_cdie_id(i, cluster_info, plat_info) when plat_info is NULL.
Instead of addressing this one case, in general if plat_info is NULL then it can cause other issues. For example in a two package system it will give warning for duplicate sysfs entry as package ID will be always zero for both packages when creating string for attribute group name.
plat_info is derived from TPMI ID TPMI_BUS_INFO, which is integral to the core TPMI design. Therefore, it should not be NULL on a production platform. Consequently, the module should fail to load if plat_info is NULL.
Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/platform-driver-x86/aEKvGCLd1qmX04Tc@stanley.mountai... Fixes: 8a54e2253e4c ("platform/x86/intel-uncore-freq: Uncore frequency control via TPMI") Signed-off-by: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250606205300.2384494-1-srinivas.pandruvada@linux... Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c @@ -269,10 +269,13 @@ static int uncore_probe(struct auxiliary
/* Get the package ID from the TPMI core */ plat_info = tpmi_get_platform_data(auxdev); - if (plat_info) - pkg = plat_info->package_id; - else + if (unlikely(!plat_info)) { dev_info(&auxdev->dev, "Platform information is NULL\n"); + ret = -ENODEV; + goto err_rem_common; + } + + pkg = plat_info->package_id;
for (i = 0; i < num_resources; ++i) { struct tpmi_uncore_power_domain_info *pd_info;