Messages in this thread Patch in this message | | | From | Mariusz Kozlowski <> | Subject | [PATCH] ide: fix use after free in ide-acpi | Date | Mon, 22 Nov 2010 20:34:38 +0100 |
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out_obj points to kfreed memory and we dereference that pointer in DEBPRINT/printk.
Signed-off-by: Mariusz Kozlowski <mk@lab.zgora.pl> --- drivers/ide/ide-acpi.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
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 @@ void ide_acpi_get_timing(ide_hwif_t *hwif) 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; } -- 1.7.0.4
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