s390/debug: Fix NULL pointer dereference in debug_set_level()

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Commit a2cec68637 ("s390/debug: Add s390dbf kernel parameter")
incorrectly removed a null-id check from debug_set_level(), introducing
a possible NULL pointer dereference for debug-API users that put
debug_register() results unchecked into debug_set_level().

Fix this by moving the check from the internal _debug_set_level()
variant back to the external debug_set_level() wrapper.

Fixes: a2cec68637 ("s390/debug: Add s390dbf kernel parameter")

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

...

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Mikhail Zaslonko 2026-09-03 15:07:31 +02:00 • committed by Vasily Gorbik

parent 9ecc4d0338

commit b1eb31d533

1 changed files with 3 additions and 3 deletions

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arch/s390/kernel/debug.c

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