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| author | Tzung-Bi Shih <tzungbi@kernel.org> | 2025-11-04 07:03:10 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-01 11:43:23 +0100 |
| commit | 6d81068685154535af06163eb585d6d9663ec7ec (patch) | |
| tree | cd6464df6d448a705c4367366a13faf62a419651 /drivers/input | |
| parent | 11c030f61adaf7cd5217d3153387c43d3cdaad5b (diff) | |
| download | linux-6d81068685154535af06163eb585d6d9663ec7ec.tar.gz linux-6d81068685154535af06163eb585d6d9663ec7ec.tar.bz2 linux-6d81068685154535af06163eb585d6d9663ec7ec.zip | |
Input: cros_ec_keyb - fix an invalid memory access
commit e08969c4d65ac31297fcb4d31d4808c789152f68 upstream.
If cros_ec_keyb_register_matrix() isn't called (due to
`buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains
NULL. An invalid memory access is observed in cros_ec_keyb_process()
when receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work()
in such case.
Unable to handle kernel read from unreadable memory at virtual address 0000000000000028
...
x3 : 0000000000000000 x2 : 0000000000000000
x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
input_event
cros_ec_keyb_work
blocking_notifier_call_chain
ec_irq_thread
It's still unknown about why the kernel receives such malformed event,
in any cases, the kernel shouldn't access `ckdev->idev` and friends if
the driver doesn't intend to initialize them.
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20251104070310.3212712-1-tzungbi@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/keyboard/cros_ec_keyb.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c index 4c81b20ff6af..78ab38eae6d2 100644 --- a/drivers/input/keyboard/cros_ec_keyb.c +++ b/drivers/input/keyboard/cros_ec_keyb.c @@ -261,6 +261,12 @@ static int cros_ec_keyb_work(struct notifier_block *nb, case EC_MKBP_EVENT_KEY_MATRIX: pm_wakeup_event(ckdev->dev, 0); + if (!ckdev->idev) { + dev_warn_once(ckdev->dev, + "Unexpected key matrix event\n"); + return NOTIFY_OK; + } + if (ckdev->ec->event_size != ckdev->cols) { dev_err(ckdev->dev, "Discarded incomplete key matrix event.\n"); |