This is a note to let you know that I've just added the patch titled

drm: udl: Properly check framebuffer mmap offsets

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-udl-properly-check-framebuffer-mmap-offsets.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 3b82a4db8eaccce735dffd50b4d4e1578099b8e8 Mon Sep 17 00:00:00 2001

From: Greg Kroah-Hartman gregkh@linuxfoundation.org Date: Wed, 21 Mar 2018 16:45:53 +0100 Subject: drm: udl: Properly check framebuffer mmap offsets

From: Greg Kroah-Hartman gregkh@linuxfoundation.org

commit 3b82a4db8eaccce735dffd50b4d4e1578099b8e8 upstream.

The memmap options sent to the udl framebuffer driver were not being checked for all sets of possible crazy values. Fix this up by properly bounding the allowed values.

Reported-by: Eyal Itkin eyalit@checkpoint.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch Link: https://patchwork.freedesktop.org/patch/msgid/20180321154553.GA18454@kroah.c... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/gpu/drm/udl/udl_fb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/udl/udl_fb.c +++ b/drivers/gpu/drm/udl/udl_fb.c @@ -158,10 +158,15 @@ static int udl_fb_mmap(struct fb_info *i { unsigned long start = vma->vm_start; unsigned long size = vma->vm_end - vma->vm_start; - unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long offset; unsigned long page, pos;

- if (offset + size > info->fix.smem_len) + if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) + return -EINVAL; + + offset = vma->vm_pgoff << PAGE_SHIFT; + + if (offset > info->fix.smem_len || size > info->fix.smem_len - offset) return -EINVAL;

pos = (unsigned long)info->fix.smem_start + offset;

Patches currently in stable-queue which might be from gregkh@linuxfoundation.org are

queue-4.9/mm-khugepaged.c-convert-vm_bug_on-to-collapse-fail.patch queue-4.9/drm-vmwgfx-fix-a-destoy-while-held-mutex-problem.patch queue-4.9/alsa-aloop-fix-access-to-not-yet-ready-substream-via-cable.patch queue-4.9/libata-disable-lpm-for-crucial-bx100-ssd-500gb-drive.patch queue-4.9/can-ifi-check-core-revision-upon-probe.patch queue-4.9/bluetooth-btusb-fix-quirk-for-atheros-1525-qca6174.patch queue-4.9/nfsd-remove-blocked-locks-on-client-teardown.patch queue-4.9/mtdchar-fix-usage-of-mtd_ooblayout_ecc.patch queue-4.9/libata-apply-nolpm-quirk-to-crucial-m500-480-and-960gb-ssds.patch queue-4.9/drm-radeon-don-t-turn-off-dp-sink-when-disconnected.patch queue-4.9/clk-bcm2835-protect-sections-updating-shared-registers.patch queue-4.9/rtlwifi-rtl8723be-fix-loss-of-signal.patch queue-4.9/libata-fix-length-validation-of-atapi-relayed-scsi-commands.patch queue-4.9/tracing-probeevent-fix-to-support-minus-offset-from-symbol.patch queue-4.9/can-cc770-fix-use-after-free-in-cc770_tx_interrupt.patch queue-4.9/libata-apply-nolpm-quirk-to-crucial-mx100-512gb-ssds.patch queue-4.9/alsa-hda-realtek-always-immediately-update-mute-led-with-pin-vref.patch queue-4.9/iio-st_pressure-st_accel-pass-correct-platform-data-to-init.patch queue-4.9/pci-add-function-1-dma-alias-quirk-for-highpoint-rocketraid-644l.patch queue-4.9/libata-modify-quirks-for-mx100-to-limit-ncq_trim-quirk-to-mu01-version.patch queue-4.9/mtd-nand-fsl_ifc-fix-nand-waitfunc-return-value.patch queue-4.9/can-ifi-repair-the-error-handling.patch queue-4.9/can-cc770-fix-queue-stall-dropped-rtr-reply.patch queue-4.9/libata-enable-queued-trim-for-samsung-ssd-860.patch queue-4.9/staging-ncpfs-memory-corruption-in-ncp_read_kernel.patch queue-4.9/ahci-add-pci-id-for-the-highpoint-rocketraid-644l-card.patch queue-4.9/drm-udl-properly-check-framebuffer-mmap-offsets.patch queue-4.9/can-cc770-fix-stalls-on-rt-linux-remove-redundant-irq-ack.patch queue-4.9/clk-sunxi-ng-a31-fix-clk_out_-clock-ops.patch queue-4.9/brcmfmac-fix-p2p_device-ethernet-address-generation.patch queue-4.9/mm-thp-do-not-wait-for-lock_page-in-deferred_split_scan.patch queue-4.9/mtd-nand-fsl_ifc-fix-eccstat-array-overflow-for-ifc-ver-2.0.0.patch queue-4.9/alsa-usb-audio-fix-parsing-descriptor-of-uac2-processing-unit.patch queue-4.9/acpi-numa-fix-pxm-to-online-numa-node-associations.patch queue-4.9/alsa-aloop-sync-stale-timer-before-release.patch queue-4.9/mips-ralink-remove-ralink_halt.patch queue-4.9/libnvdimm-btt-blk-do-integrity-setup-before-add_disk.patch queue-4.9/acpi-watchdog-fix-off-by-one-error-at-resource-assignment.patch queue-4.9/mtd-nand-fsl_ifc-read-eccstat0-and-eccstat1-registers-for-ifc-2.0.patch queue-4.9/mmc-dw_mmc-fix-falling-from-idmac-to-pio-mode-when-dw_mci_reset-occurs.patch queue-4.9/libata-make-crucial-bx100-500gb-lpm-quirk-apply-to-all-firmware-versions.patch queue-4.9/clk-bcm2835-fix-ana-maskx-definitions.patch queue-4.9/libata-remove-warn-for-dma-or-pio-command-without-data.patch queue-4.9/mm-vmalloc-add-interfaces-to-free-unmapped-page-table.patch queue-4.9/mm-shmem-do-not-wait-for-lock_page-in-shmem_unused_huge_shrink.patch queue-4.9/x86-mm-implement-free-pmd-pte-page-interfaces.patch queue-4.9/libata-don-t-try-to-pass-through-ncq-commands-to-non-ncq-devices.patch