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fs: handle failed audit_log_start properly
audit_log_start() may return NULL, this is unchecked by the caller in audit_log_link_denied() and could cause a NULL ptr deref. Introduced by commit a51d9ea ("fs: add link restriction audit reporting"). Signed-off-by: Sasha Levin <firstname.lastname@example.org> Signed-off-by: Al Viro <email@example.com>
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