To te able to unregister stuff from isrs, the corresponding table was copied. Nobody seems to unregister stuff that way, so it does not help. But there are stack-allocated objects passed to these isrs giving chances of UAF of these objects if irqs are unregistered while they are handled, so better do not copy that table.
Suggested-by: [email protected] Signed-off-by: Andreas Kemnade <[email protected]> --- Fix for drm variant fo driver: https://lore.kernel.org/lkml/[email protected]/ --- drivers/video/fbdev/omap2/omapfb/dss/dsi.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c index 330d9fb7d2b0..d98db01fdd39 100644 --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c @@ -326,8 +326,6 @@ struct dsi_data { spinlock_t irq_lock; struct dsi_isr_tables isr_tables; - /* space for a copy used by the interrupt handler */ - struct dsi_isr_tables isr_tables_copy; int update_channel; #ifdef DSI_PERF_MEASURE @@ -838,15 +836,10 @@ static irqreturn_t omap_dsi_irq_handler(int irq, void *arg) timer_delete(&dsi->te_timer); #endif - /* make a copy and unlock, so that isrs can unregister - * themselves */ - memcpy(&dsi->isr_tables_copy, &dsi->isr_tables, - sizeof(dsi->isr_tables)); + dsi_handle_isrs(&dsi->isr_tables, irqstatus, vcstatus, ciostatus); spin_unlock(&dsi->irq_lock); - dsi_handle_isrs(&dsi->isr_tables_copy, irqstatus, vcstatus, ciostatus); - dsi_handle_irq_errors(dsidev, irqstatus, vcstatus, ciostatus); dsi_collect_irq_stats(dsidev, irqstatus, vcstatus, ciostatus); --- base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482 change-id: 20260702-fbomap-uaf-fix-167ed8a8bf38 Best regards, -- Andreas Kemnade <[email protected]>
