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UPSTREAM: list: Split list_del() debug checking into separate function
(cherry-picked from 0cd340dcb05c4a43742fe156f36737bb2a321bfd) Similar to the list_add() debug consolidation, this commit consolidates the debug checking performed during CONFIG_DEBUG_LIST into a new __list_del_entry_valid() function, and stops list updates when corruption is found. Refactored from same hardening in PaX and Grsecurity. Change-Id: I54a9c0eb0778753a4d91a92746881c7583aa1f92 Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Satya Tangirala <satyat@google.com> Signed-off-by: khusika <khusikadhamar@gmail.com>
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