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Jiangshan YiandGreg Kroah-Hartman
7fb13fd7e9
Commitb1b4efea05("serial: 8250_mid: Disable DMA for selected platforms") replaced the dnv_board setup and exit callbacks with PTR_IF(false, ...), which evaluates to NULL. However, the three call sites in mid8250_probe() and mid8250_remove() unconditionally dereference these function pointers without NULL checks, causing a NULL pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon D (ICX-D/CDF), or Snowridge (SNR) platform. Fix this by adding the missing NULL checks before calling the setup and exit callbacks. Fixes:b1b4efea05("serial: 8250_mid: Disable DMA for selected platforms") Cc: stable <stable@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn> Link: https://patch.msgid.link/20260715073546.1875083-1-yijiangshan@kylinos.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>