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

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When debug_register_static() fails, it clears areas, active_pages and
active_entries but leaves the area bounds unchanged. Copying such an
area, either by opening its view file or via debug_dump(), makes
debug_info_copy() dereference the NULL pointers.

Skip the copy loop when the source has no areas.

Closes: https://lore.kernel.org/r/20260903132123.12F271F00A3F@smtp.kernel.org
Fixes: d72541f945 ("s390/debug: add early tracing support")
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Mikhail Zaslonko 2026-09-16 18:06:26 +02:00 committed by Heiko Carstens
parent 28e29992b0
commit 012bfcd5a5
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kernel/debug.c
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@ -434,7 +434,8 @@ static debug_info_t *debug_info_copy(debug_info_t *in, int mode)
debug_info_free(rc);
} while (1);
if (mode == NO_AREAS)
/* debug_register_static() failure leaves areas NULL, bounds intact */
if (mode == NO_AREAS || !in->areas)
goto out;
for (i = 0; i < in->nr_areas; i++) {