printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX

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Shifting 1 << 31 on a 32-bit int causes signed integer overflow, which
leads to undefined behavior. To prevent this, cast 1 to u32 before
performing the shift, ensuring well-defined behavior.

This change explicitly avoids any potential overflow by ensuring that
the shift occurs on an unsigned 32-bit integer.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Acked-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240928113608.1438087-1-visitorckw@gmail.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Kuan-Wei Chiu 2024-09-28 19:36:08 +08:00 • committed by Greg Kroah-Hartman

parent 99795e62e7

commit bb8ff054e1

1 changed files with 1 additions and 1 deletions

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kernel/printk/printk.c

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