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Make use of the flex_array_size() helper to calculate the size of a flexible array member within an enclosing structure. This helper offers defense-in-depth against potential integer overflows, while at the same time makes it explicitly clear that we are dealing with a flexible array member. Signed-off-by: Gustavo A. R. Silva <[email protected]> Link: https://lore.kernel.org/r/20200729233557.GA17693@embeddedor Signed-off-by: Greg Kroah-Hartman <[email protected]>