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

staging: gasket: Check the return value of gasket_get_bar_index()

to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 769acc3656d93aaacada814939743361d284fd87 Mon Sep 17 00:00:00 2001

From: Oscar Carter oscar.carter@gmx.com Date: Fri, 1 May 2020 17:51:18 +0200 Subject: staging: gasket: Check the return value of gasket_get_bar_index()

Check the return value of gasket_get_bar_index function as it can return a negative one (-EINVAL). If this happens, a negative index is used in the "gasket_dev->bar_data" array.

Addresses-Coverity-ID: 1438542 ("Negative array index read") Fixes: 9a69f5087ccc2 ("drivers/staging: Gasket driver framework + Apex driver") Signed-off-by: Oscar Carter oscar.carter@gmx.com Cc: stable stable@vger.kernel.org Reviewed-by: Richard Yeh rcy@google.com Link: https://lore.kernel.org/r/20200501155118.13380-1-oscar.carter@gmx.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/gasket/gasket_core.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c index 8e0575fcb4c8..67325fbaf760 100644 --- a/drivers/staging/gasket/gasket_core.c +++ b/drivers/staging/gasket/gasket_core.c @@ -925,6 +925,10 @@ do_map_region(const struct gasket_dev *gasket_dev, struct vm_area_struct *vma, gasket_get_bar_index(gasket_dev, (vma->vm_pgoff << PAGE_SHIFT) + driver_desc->legacy_mmap_address_offset); + + if (bar_index < 0) + return DO_MAP_REGION_INVALID; + phys_base = gasket_dev->bar_data[bar_index].phys_base + phys_offset; while (mapped_bytes < map_length) { /*