x86/boot: Validate console=uart8250 baud rate to fix early boot hang

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commit ffa0aa5b62 upstream.

When the baud rate is empty, 0, invalid, or overflows to 0 when stored
as an int, the system will hang during early boot because of a division
by zero in early_serial_init().

Fall back to DEFAULT_BAUD when the resulting baud rate is 0 to prevent
an early system hang.

Fixes: ce0aa5dd20 ("x86, setup: Make the setup code also accept console=uart8250")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260713194924.126472-3-thorsten.blum@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Thorsten Blum 2026-07-13 21:49:25 +02:00 • committed by Greg Kroah-Hartman

parent e2dac91380

commit 24fbed0a2a

1 changed files with 7 additions and 4 deletions

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arch/x86/boot/early_serial_console.c

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