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Subject[PATCH] hp-wmi: fix use after free
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Date
[  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:[<f80b3104>] 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] [<f80b317b>] hp_wmi_dock_state+0x2b/0x40 [hp_wmi]
[ 191.310054] [<f80b6093>] hp_wmi_init+0x93/0x1a8 [hp_wmi]
[ 191.310057] [<c10011f0>] do_one_initcall+0x30/0x170
[ 191.310061] [<c107ab9f>] sys_init_module+0xef/0x1a60
[ 191.310064] [<c149f998>] sysenter_do_call+0x12/0x28
[ 191.310067] [<ffffffff>] 0xffffffff

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
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 f94017b..f8f43ff 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) {



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