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linux-stable/drivers/tty
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Andy Shevchenko 2b837f13a8 serial: 8250_port: Check IRQ data before use 
commit cce7fc8b29 upstream.

In case the leaf driver wants to use IRQ polling (irq = 0) and
IIR register shows that an interrupt happened in the 8250 hardware
the IRQ data can be NULL. In such a case we need to skip the wake
event as we came to this path from the timer interrupt and quite
likely system is already awake.

Without this fix we have got an Oops:

    serial8250: ttyS0 at I/O 0x3f8 (irq = 0, base_baud = 115200) is a 16550A
    ...
    BUG: kernel NULL pointer dereference, address: 0000000000000010
    RIP: 0010:serial8250_handle_irq+0x7c/0x240
    Call Trace:
     ? serial8250_handle_irq+0x7c/0x240
     ? __pfx_serial8250_timeout+0x10/0x10

Fixes: 0ba9e3a13c ("serial: 8250: Add missing wakeup event reporting")
Cc: stable <stable@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20230831222555.614426-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2023-10-06 13:18:21 +02:00
..
hvc hvc/xen: prevent concurrent accesses to the shared ring 2023-03-30 12:47:48 +02:00
ipwireless
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serdev
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serial serial: 8250_port: Check IRQ data before use 2023-10-06 13:18:21 +02:00
vt vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF 2023-05-24 17:36:54 +01:00
Kconfig
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Makefile
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amiserial.c
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ehv_bytechan.c
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goldfish.c
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mips_ejtag_fdc.c
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moxa.c
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moxa.h
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mxser.c
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n_gsm.c Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux" 2023-10-06 13:18:21 +02:00
n_hdlc.c
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n_null.c
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n_tty.c tty: fix hang on tty device with no_room set 2023-08-03 10:22:29 +02:00
nozomi.c
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pty.c
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synclink_gt.c
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sysrq.c workqueue: Introduce show_one_worker_pool and show_one_workqueue. 2023-05-11 23:00:35 +09:00
tty.h tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH 2023-05-11 23:00:16 +09:00
tty_audit.c
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tty_baudrate.c
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tty_buffer.c
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tty_io.c tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH 2023-05-11 23:00:16 +09:00
tty_ioctl.c tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH 2023-05-11 23:00:16 +09:00
tty_jobctrl.c
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tty_ldisc.c
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tty_ldsem.c
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tty_mutex.c
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tty_port.c
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ttynull.c
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vcc.c
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