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It's a valid case to call nla_put() with NULL data and 0 len. It's done e.g. in the nla_put_attr(). There has to be a check for data in nla_put() as passing NULL to the memcpy() is not allowed. Even if length is 0, both pointers have to be valid. For a reference see C99 standard (7.21.1/2), it says: "pointer arguments on such a call shall still have valid values". Reported-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us> Signed-off-by: Rafał Miłecki <rafal@milecki.pl> [christian.brauner@ubuntu.com: adapted commit message] Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
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