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get_signal: hide_si_addr_tag_bits: fix the usage of uninitialized ksig
ksig->ka and ksig->info are not initialized if get_signal() returns 0 or if the caller is PF_USER_WORKER. Check signr != 0 before SA_EXPOSE_TAGBITS and move the "out" label down. The latter means that ksig->sig won't be initialized if a PF_USER_WORKER thread gets a fatal signal but this is fine, PF_USER_WORKER's don't use ksig. And there is nothing new, in this case ksig->ka and ksig-info are not initialized anyway. Add a comment. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Oleg Nesterov <[email protected]> Cc: Christian Brauner <[email protected]> Cc: Eric W. Biederman <[email protected]> Cc: Peter Collingbourne <[email protected]> Cc: Wen Yang <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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