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s390/pci: Fix double-free and NULL deref in zpci MSI domain cleanup From: Niklas Schnelle To: Tobias Schumacher , Gerd Bayer , Julian Ruess , Farhan Ali , Christian Borntraeger , Halil Pasic , Matthew Rosato Cc: Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20261005-s390_irq_domain_fixes-v2-1-d45b824874c0@linux.ibm.com> References: <20261005-s390_irq_domain_fixes-v2-0-d45b824874c0@linux.ibm.com> <20261005-s390_irq_domain_fixes-v2-1-d45b824874c0@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; keydata=mQINBGHm3M8BEAC+MIQkfoPIAKdjjk84OSQ8erd2OICj98+GdhMQpIjHXn/RJdCZLa58k /ay5x0xIHkWzx1JJOm4Lki7WEzRbYDexQEJP0xUia0U+4Yg7PJL4Dg/W4Ho28dRBROoJjgJSLSHwc 3/1pjpNlSaX/qg3ZM8+/EiSGc7uEPklLYu3gRGxcWV/944HdUyLcnjrZwCn2+gg9ncVJjsimS0ro/ 2wU2RPE4ju6NMBn5Go26sAj1owdYQQv9t0d71CmZS9Bh+2+cLjC7HvyTHKFxVGOznUL+j1a45VrVS 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suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610060038 On Mon, 2026-10-05 at 14:03 +0200, Tobias Schumacher wrote: > zpci_remove_parent_msi_domain() dereferences zbus->msi_parent_domain > unconditionally and does not clear it afterwards. >=20 > zpci_bus_create_pci_bus() removes the domain when pci_create_root_bus() > fails, then zpci_bus_release() removes it again on the last kref_put(), > reading ->fwnode from the freed irq_domain and freeing it twice. >=20 > If zpci_alloc_domain() or zpci_create_parent_msi_domain() fails, no domai= n > is created at all; zbus is kzalloc'd, so the same release path dereferenc= es > NULL. >=20 > Return early when there is no domain, and clear the pointer after removin= g > one. >=20 > Fixes: f770950a4709 ("s390/pci: Migrate s390 IRQ logic to IRQ domain API"= ) > Cc: stable@vger.kernel.org > Signed-off-by: Tobias Schumacher > --- > arch/s390/pci/pci_irq.c | 4 ++++ > 1 file changed, 4 insertions(+) >=20 > diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c > index 9c9ed3d8d959..c9520a16ca75 100644 > --- a/arch/s390/pci/pci_irq.c > +++ b/arch/s390/pci/pci_irq.c > @@ -533,9 +533,13 @@ void zpci_remove_parent_msi_domain(struct zpci_bus *= zbus) > { > struct fwnode_handle *fn; > =20 > + if (!zbus->msi_parent_domain) > + return; > + > fn =3D zbus->msi_parent_domain->fwnode; > irq_domain_remove(zbus->msi_parent_domain); > irq_domain_free_fwnode(fn); > + zbus->msi_parent_domain =3D NULL; > } > =20 > static void __init cpu_enable_directed_irq(void *unused) Thanks for the fix! Reviewed-by: Niklas Schnelle