merged. Bruce
In message: [linux-yocto][v6.12/standard/x86 and v6.12/standard/preempt-rt/x86][PATCH] platform/x86: intel_pmc_ipc: fix ACPI buffer memory leak on 24/11/2025 [email protected] wrote: > From: Yongxin Liu <[email protected]> > > The intel_pmc_ipc() function uses ACPI_ALLOCATE_BUFFER to allocate memory > for the ACPI evaluation result but never frees it, causing a 192-byte > memory leak on each call. > > This leak is triggered during network interface initialization when the > stmmac driver calls intel_mac_finish() -> intel_pmc_ipc(). > > unreferenced object 0xffff96a848d6ea80 (size 192): > comm "dhcpcd", pid 541, jiffies 4294684345 > hex dump (first 32 bytes): > 04 00 00 00 05 00 00 00 98 ea d6 48 a8 96 ff ff ...........H.... > 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................ > backtrace (crc b1564374): > kmemleak_alloc+0x2d/0x40 > __kmalloc_noprof+0x2fa/0x730 > acpi_ut_initialize_buffer+0x83/0xc0 > acpi_evaluate_object+0x29a/0x2f0 > intel_pmc_ipc+0xfd/0x170 > intel_mac_finish+0x168/0x230 > stmmac_mac_finish+0x3d/0x50 > phylink_major_config+0x22b/0x5b0 > phylink_mac_initial_config.constprop.0+0xf1/0x1b0 > phylink_start+0x8e/0x210 > __stmmac_open+0x12c/0x2b0 > stmmac_open+0x23c/0x380 > __dev_open+0x11d/0x2c0 > __dev_change_flags+0x1d2/0x250 > netif_change_flags+0x2b/0x70 > dev_change_flags+0x40/0xb0 > > Add kfree() to properly release the allocated buffer. > > Fixes: 941f283707de ("arch: x86: add IPC mailbox accessor function and add > SoC register access") > Signed-off-by: Yongxin Liu <[email protected]> > --- > arch/x86/platform/intel/pmc_ipc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/platform/intel/pmc_ipc.c > b/arch/x86/platform/intel/pmc_ipc.c > index a96234982710..e83dadd3a9e8 100644 > --- a/arch/x86/platform/intel/pmc_ipc.c > +++ b/arch/x86/platform/intel/pmc_ipc.c > @@ -67,6 +67,7 @@ int intel_pmc_ipc(struct pmc_ipc_cmd *ipc_cmd, u32 *rbuf) > return -EINVAL; > } > > + kfree(obj); > return 0; > } > EXPORT_SYMBOL(intel_pmc_ipc); > -- > 2.49.1 >
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