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drivers/tty/serial/pch_uart.c: don't oops if dmi_get_system_info returns NULL
If dmi_get_system_info() returns NULL, pch_uart_init_port() will dereferencea a zero pointer. This oops was observed on an Atom based board which has no BIOS, but a bootloder which doesn't provide DMI data. Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Cc: Greg KH <gregkh@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 3 additions and 1 deletions
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@ -1397,6 +1397,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
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int fifosize, base_baud;
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int port_type;
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struct pch_uart_driver_data *board;
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const char *board_name;
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board = &drv_dat[id->driver_data];
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port_type = board->port_type;
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@ -1412,7 +1413,8 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
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base_baud = 1843200; /* 1.8432MHz */
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/* quirk for CM-iTC board */
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if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC"))
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board_name = dmi_get_system_info(DMI_BOARD_NAME);
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if (board_name && strstr(board_name, "CM-iTC"))
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base_baud = 192000000; /* 192.0MHz */
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switch (port_type) {
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