[Xen-changelog] [xen master] xen/arm: domain_build: harden make_cpus_node()

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commit fef8d99fbce1a5e7ddfd22b0f33940b8d6193ec8
Author:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
AuthorDate: Wed Oct 9 17:42:11 2019 -0700
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Thu Oct 10 11:17:08 2019 -0700

    xen/arm: domain_build: harden make_cpus_node()
    
    make_cpus_node() is using a static buffer to generate the FDT node name.
    While mpdir_aff is a 64-bit integer, we only ever use the bits [23:0] as
    only AFF{0, 1, 2} are supported for now.
    
    To avoid any potential issues in the future, check that mpdir_aff has
    only bits [23:0] set.
    
    Take the opportunity to reduce the size of the buffer. Indeed, only 8
    characters are needed to print a 32-bit hexadecimal number. So
    sizeof("cpu@") + 8 + 1 (for '\0') = 13 characters is sufficient.
    
    Fixes: c81a791d34 (xen/arm: Set 'reg' of cpu node for dom0 to match MPIDR's 
affinity)
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
    Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
    Release-acked-by: Juergen Gross <jgross@xxxxxxxx>
--
generated by git-patchbot for /home/xen/git/xen.git#master

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