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2037d8cf8c
commit2e6c86be0eupstream. The two bugs are here: if (encoder) { if (bridge && bridge->timings) The list iterator value 'encoder/bridge' will *always* be set and non-NULL by drm_for_each_encoder()/list_for_each_entry(), so it is incorrect to assume that the iterator value will be NULL if the list is empty or no element is found. To fix the bug, use a new variable '*_iter' as the list iterator, while use the old variable 'encoder/bridge' as a dedicated pointer to point to the found element. Cc: stable@vger.kernel.org Fixes:99e360442f("drm/stm: Fix bus_flags handling") Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com> Acked-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com> Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220327055355.3808-1-xiam0nd.tong@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>