From: Jerry Snitselaar jsnitsel@redhat.com
[ Upstream commit 620bf9f981365c18cc2766c53d92bf8131c63f32 ]
A splat from kmem_cache_destroy() was seen with a kernel prior to commit ee2653bbe89d ("iommu/vt-d: Remove domain and devinfo mempool") when there was a failure in init_dmars(), because the iommu_domain cache still had objects. While the mempool code is now gone, there still is a leak of the si_domain memory if init_dmars() fails. So clean up si_domain in the init_dmars() error path.
Cc: Lu Baolu baolu.lu@linux.intel.com Cc: Joerg Roedel joro@8bytes.org Cc: Will Deacon will@kernel.org Cc: Robin Murphy robin.murphy@arm.com Fixes: 86080ccc223a ("iommu/vt-d: Allocate si_domain in init_dmars()") Signed-off-by: Jerry Snitselaar jsnitsel@redhat.com Link: https://lore.kernel.org/r/20221010144842.308890-1-jsnitsel@redhat.com Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/iommu.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 31bc50e538a3..ecc0b05b2796 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2400,6 +2400,7 @@ static int __init si_domain_init(int hw)
if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) { domain_exit(si_domain); + si_domain = NULL; return -EFAULT; }
@@ -3042,6 +3043,10 @@ static int __init init_dmars(void) disable_dmar_iommu(iommu); free_dmar_iommu(iommu); } + if (si_domain) { + domain_exit(si_domain); + si_domain = NULL; + }
return ret; }