diff options
| author | Oscar Carter <oscar.carter@gmx.com> | 2020-05-01 17:51:18 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-14 07:58:27 +0200 |
| commit | b8fe132bae6654a0e1ae8439e3a9f63480e4059d (patch) | |
| tree | b2f5f2e2a048c7acb5d373c00028016d8501f1c4 | |
| parent | 53f453031a207186f3b6734282b759bb98ae83e8 (diff) | |
staging: gasket: Check the return value of gasket_get_bar_index()
commit 769acc3656d93aaacada814939743361d284fd87 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/gasket/gasket_core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c index 13179f063a61..6f9c0d18d9ce 100644 --- a/drivers/staging/gasket/gasket_core.c +++ b/drivers/staging/gasket/gasket_core.c @@ -926,6 +926,10 @@ 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) { /* |