Re: [PATCH iwl-net] idpf: fix NULL pointer dereference and memory leak in interrupt request

On Fri, Sep 04, 2026 at 05:18:27PM +0800, Zhang Yunfei wrote:

The kasprintf() call in idpf_vport_intr_req_irq() can return NULL on
memory pressure, but the result is passed directly to request_irq()
without a NULL check. The IRQ core then stores this pointer as
action->name and dereferences it later from /proc/interrupts and
procfs, leading to a NULL pointer dereference.

Add a NULL check after kasprintf() and bail out with -ENOMEM.

Additionally, when request_irq() fails, request_threaded_irq() frees
the irqaction itself without taking ownership of the name string, so
the caller-allocated name is leaked. Free it on the error path only.
On the success path the name is owned by the irq action and released
later via kfree(free_irq(...)) in the cleanup loop, so it must not be
freed here.

Fixes: d4d558718266 ("idpf: initialize interrupts and enable vport")
Cc: stable@vger.kernel.org # 6.7
Signed-off-by: Zhang Yunfei <redacted>

Reviewed-by: Simon Horman <horms@kernel.org>