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xsa395.patch
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File xsa395.patch of Package xen.23271
From: Julien Grall <jgrall@amazon.com> Subject: passthrough/x86: stop pirq iteration immediately in case of error pt_pirq_iterate() will iterate in batch over all the PIRQs. The outer loop will bail out if 'rc' is non-zero but the inner loop will continue. This means 'rc' will get clobbered and we may miss any errors (such as -ERESTART in the case of the callback pci_clean_dpci_irq()). This is XSA-395. Fixes: c24536b636f2 ("replace d->nr_pirqs sized arrays with radix tree") Fixes: f6dd295381f4 ("dpci: replace tasklet with softirq") Signed-off-by: Julien Grall <jgrall@amazon.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> --- a/xen/drivers/passthrough/io.c +++ b/xen/drivers/passthrough/io.c @@ -803,7 +803,11 @@ int pt_pirq_iterate(struct domain *d, pirq = pirqs[i]->pirq; if ( (pirq_dpci->flags & HVM_IRQ_DPCI_MAPPED) ) + { rc = cb(d, pirq_dpci, arg); + if ( rc ) + break; + } } } while ( !rc && ++pirq < d->nr_pirqs && n == ARRAY_SIZE(pirqs) );
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