On 10/04/17 17:11, Russell Currey wrote:
eeh_handle_special_event() is called when an EEH event is detected but
can't be narrowed down to a specific PE. This function looks through
every PE to find one in an erroneous state, then calls the regular event
handler eeh_handle_normal_event() once it knows which PE has an error.
However, if eeh_handle_normal_event() found that the PE cannot possibly
be recovered, it will free it, rendering the passed PE stale.
This leads to a use after free in eeh_handle_special_event() as it attempts to
clear the "recovering" state on the PE after eeh_handle_normal_event() returns.
Thus, make sure the PE is valid when attempting to clear state in
eeh_handle_special_event().
Cc: <sta...@vger.kernel.org> #3.10+
Reported-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Signed-off-by: Russell Currey <rus...@russell.cc>
Reviewed-by: Andrew Donnellan <andrew.donnel...@au1.ibm.com>
--
Andrew Donnellan OzLabs, ADL Canberra
andrew.donnel...@au1.ibm.com IBM Australia Limited
