ide: fix use after free in ide-acpi
out_obj points to kfreed memory and we dereference that pointer in
DEBPRINT/printk.
Signed-off-by: Mariusz Kozlowski <mk@lab.zgora.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index c26c119..2af8cb4 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -416,21 +416,21 @@
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
- kfree(output.pointer);
DEBPRINT("Run _GTM: error: "
"expected object type of ACPI_TYPE_BUFFER, "
"got 0x%x\n", out_obj->type);
+ kfree(output.pointer);
return;
}
if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
out_obj->buffer.length != sizeof(struct GTM_buffer)) {
- kfree(output.pointer);
printk(KERN_ERR
"%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
"addr (0x%p)\n",
__func__, out_obj->buffer.length,
sizeof(struct GTM_buffer), out_obj->buffer.pointer);
+ kfree(output.pointer);
return;
}