Sean Christopherson 2a20592baf KVM: Stop looking for coalesced MMIO zones if the bus is destroyed ... commit 5d3c4c79384af06e3c8e25b7770b6247496b4417 upstream. Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement. Fixes: f65886606c ("KVM: fix memory leak in kvm_io_bus_unregister_dev()") Cc: stable@vger.kernel.org Reported-by: Hao Sun <sunhao.th@gmail.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210412222050.876100-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-05-14 09:50:04 +02:00
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kvm	KVM: Stop looking for coalesced MMIO zones if the bus is destroyed	2021-05-14 09:50:04 +02:00
lib	irqbypass: do not start cons/prod when failed connect	2020-08-05 11:08:42 -04:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00