From 0401846c339fbdfb9bd822d83b43e8a9f7d072a4 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 11 Jul 2011 12:22:21 +0200 Subject: [PATCH] hp-wmi: fix use after free [ 191.310008] WARNING: kmemcheck: Caught 32-bit read from freed memory (f0d25f14) [ 191.310011] c056d2f088000000105fd2f00000000050415353040000000000000000000000 [ 191.310020] i i i i f f f f f f f f f f f f f f f f f f f f f f f f f f f f [ 191.310027] ^ [ 191.310029] [ 191.310032] Pid: 737, comm: modprobe Not tainted 3.0.0-rc5+ #268 Hewlett-Packard HP Compaq 6005 Pro SFF PC/3047h [ 191.310036] EIP: 0060:[] EFLAGS: 00010286 CPU: 0 [ 191.310039] EIP is at hp_wmi_perform_query+0x104/0x150 [hp_wmi] [ 191.310041] EAX: f0d25601 EBX: f0d25f00 ECX: 000121cf EDX: 000121ce [ 191.310043] ESI: f0d25f10 EDI: f0f97ea8 EBP: f0f97ec4 ESP: c173f34c [ 191.310045] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 191.310046] CR0: 8005003b CR2: f540c000 CR3: 30f30000 CR4: 000006d0 [ 191.310048] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 191.310050] DR6: ffff4ff0 DR7: 00000400 [ 191.310051] [] hp_wmi_dock_state+0x2b/0x40 [hp_wmi] [ 191.310054] [] hp_wmi_init+0x93/0x1a8 [hp_wmi] [ 191.310057] [] do_one_initcall+0x30/0x170 [ 191.310061] [] sys_init_module+0xef/0x1a60 [ 191.310064] [] sysenter_do_call+0x12/0x28 [ 191.310067] [] 0xffffffff Signed-off-by: Eric Dumazet Signed-off-by: Matthew Garrett --- drivers/platform/x86/hp-wmi.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c index f94017bcdd6e..e2faa3cbb792 100644 --- a/drivers/platform/x86/hp-wmi.c +++ b/drivers/platform/x86/hp-wmi.c @@ -207,6 +207,7 @@ static int hp_wmi_perform_query(int query, int write, void *buffer, }; struct acpi_buffer input = { sizeof(struct bios_args), &args }; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; + u32 rc; if (WARN_ON(insize > sizeof(args.data))) return -EINVAL; @@ -224,13 +225,13 @@ static int hp_wmi_perform_query(int query, int write, void *buffer, } bios_return = (struct bios_return *)obj->buffer.pointer; + rc = bios_return->return_code; - if (bios_return->return_code) { - if (bios_return->return_code != HPWMI_RET_UNKNOWN_CMDTYPE) - pr_warn("query 0x%x returned error 0x%x\n", - query, bios_return->return_code); + if (rc) { + if (rc != HPWMI_RET_UNKNOWN_CMDTYPE) + pr_warn("query 0x%x returned error 0x%x\n", query, rc); kfree(obj); - return bios_return->return_code; + return rc; } if (!outsize) { -- 2.39.2