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/20240226165650.GA20829@redhat.comSigned-off-by:Oleg Nesterov <oleg@redhat.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Wen Yang <wenyang.linux@foxmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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