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VanGiang Nguyen
46c4079460
commit9a22b28123upstream. When submitting more than 2^32 padata objects to padata_do_serial, the current sorting implementation incorrectly sorts padata objects with overflowed seq_nr, causing them to be placed before existing objects in the reorder list. This leads to a deadlock in the serialization process as padata_find_next cannot match padata->seq_nr and pd->processed because the padata instance with overflowed seq_nr will be selected next. To fix this, we use an unsigned integer wrap around to correctly sort padata objects in scenarios with integer overflow. Fixes:bfde23ce20("padata: unbind parallel jobs from specific CPUs") Cc: <stable@vger.kernel.org> Co-developed-by: Christian Gafert <christian.gafert@rohde-schwarz.com> Signed-off-by: Christian Gafert <christian.gafert@rohde-schwarz.com> Co-developed-by: Max Ferger <max.ferger@rohde-schwarz.com> Signed-off-by: Max Ferger <max.ferger@rohde-schwarz.com> Signed-off-by: Van Giang Nguyen <vangiang.nguyen@rohde-schwarz.com> Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>