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xen.19911
5fbd042b-memory-off-by-one-in-XSA-346.patch
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File 5fbd042b-memory-off-by-one-in-XSA-346.patch of Package xen.19911
# Commit 9b156bcc3ffcc7949edd4460b718a241e87ae302 # Date 2020-11-24 14:01:31 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> memory: fix off-by-one in XSA-346 change The comparison against ARRAY_SIZE() needs to be >= in order to avoid overrunning the pages[] array. This is XSA-355. Fixes: 5777a3742d88 ("IOMMU: hold page ref until after deferred TLB flush") Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Julien Grall <jgrall@amazon.com> --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -861,7 +861,7 @@ int xenmem_add_to_physmap(struct domain ++extra.ppage; /* Check for continuation if it's not the last iteration. */ - if ( (++done > ARRAY_SIZE(pages) && extra.ppage) || + if ( (++done >= ARRAY_SIZE(pages) && extra.ppage) || (xatp->size > done && hypercall_preempt_check()) ) { rc = start + done;
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