This is a note to let you know that I've just added the patch titled drm/ast: Fix incorrect free on ioregs to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-ast-fix-incorrect-free-on-ioregs.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From dc25ab067645eabd037f1a23d49a666f9e0b8c68 Mon Sep 17 00:00:00 2001 From: Sam Bobroff <sbobroff@xxxxxxxxxxxxx> Date: Mon, 5 Nov 2018 16:57:47 +1100 Subject: drm/ast: Fix incorrect free on ioregs From: Sam Bobroff <sbobroff@xxxxxxxxxxxxx> commit dc25ab067645eabd037f1a23d49a666f9e0b8c68 upstream. If the platform has no IO space, ioregs is placed next to the already allocated regs. In this case, it should not be separately freed. This prevents a kernel warning from __vunmap "Trying to vfree() nonexistent vm area" when unloading the driver. Fixes: 0dd68309b9c5 ("drm/ast: Try to use MMIO registers when PIO isn't supported") Signed-off-by: Sam Bobroff <sbobroff@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/ast/ast_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -583,7 +583,8 @@ void ast_driver_unload(struct drm_device drm_mode_config_cleanup(dev); ast_mm_fini(ast); - pci_iounmap(dev->pdev, ast->ioregs); + if (ast->ioregs != ast->regs + AST_IO_MM_OFFSET) + pci_iounmap(dev->pdev, ast->ioregs); pci_iounmap(dev->pdev, ast->regs); kfree(ast); } Patches currently in stable-queue which might be from sbobroff@xxxxxxxxxxxxx are queue-4.19/drm-ast-fix-incorrect-free-on-ioregs.patch