diff options
| author | Hannah Williams <hannah.williams@intel.com> | 2018-05-27 09:58:25 -0700 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2018-05-30 01:10:44 +0000 |
| commit | b81362a82e40fac5c6debd8e0034feacb00d5e0a (patch) | |
| tree | 841dde898fa692343c6e74eb783fc5d1a5b2b9ee /payloads/libpayload/drivers/i8042 | |
| parent | 5474eb15ef4cdf6c4f9df9d679d4b92354c178b8 (diff) | |
libpayload-x86: i8042: fix i8042_data_ready_ps2 and i8042_data_ready_aux
keyboard_disconnect was called without keyboard_init being called and in this
case keyboard_havechar returns true because i8042_data_ready_ps2 is
dereferencing uninitialized variable ps2_fifo from within fifo_is_empty causing
keyboard_disconnect to be stuck in this while loop.
while (keyboard_havechar())
keyboard_getchar();
BUG=b:80299098
TEST=Check if the normal mode path in depthcharge is not causing a hang
Change-Id: I944b4836005c887a2715717dff2df1b5a220818e
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/26590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'payloads/libpayload/drivers/i8042')
| -rw-r--r-- | payloads/libpayload/drivers/i8042/i8042.c | 6 | ||||
| -rw-r--r-- | payloads/libpayload/drivers/i8042/keyboard.c | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/i8042/i8042.c b/payloads/libpayload/drivers/i8042/i8042.c index 1bf18556f2..b67944871f 100644 --- a/payloads/libpayload/drivers/i8042/i8042.c +++ b/payloads/libpayload/drivers/i8042/i8042.c @@ -87,6 +87,8 @@ static void fifo_push(struct fifo *fifo, u8 c) */ static int fifo_is_empty(struct fifo *fifo) { + if (!fifo) + return 1; return fifo->tx == fifo->rx; } @@ -332,6 +334,8 @@ static void i8042_data_poll(void) */ u8 i8042_data_ready_ps2(void) { + if (!initialized) + return 0; i8042_data_poll(); return !fifo_is_empty(ps2_fifo); } @@ -341,6 +345,8 @@ u8 i8042_data_ready_ps2(void) */ u8 i8042_data_ready_aux(void) { + if (!initialized) + return 0; i8042_data_poll(); return !fifo_is_empty(aux_fifo); } diff --git a/payloads/libpayload/drivers/i8042/keyboard.c b/payloads/libpayload/drivers/i8042/keyboard.c index a4f91b047a..a24d5a22cb 100644 --- a/payloads/libpayload/drivers/i8042/keyboard.c +++ b/payloads/libpayload/drivers/i8042/keyboard.c @@ -324,6 +324,9 @@ void keyboard_disconnect(void) if (inb(0x64) == 0xFF) return; + if (!i8042_has_ps2()) + return; + /* Empty keyboard buffer */ while (keyboard_havechar()) keyboard_getchar(); |