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s390/debug: Reject NULL debug info in debug_dump()

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debug_dump() passes id on to debug_info_copy(), which dereferences
in->name unchecked. debug_unregister(), debug_set_size() and
debug_register_view() guard against a NULL id but debug_dump() does not.
Nothing reaches this today, but add the check for consistency.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260910110147.96E851F000FF@smtp.kernel.org/
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-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 18:53:30 +02:00 committed by Heiko Carstens
parent f4d04425e6
commit 4467df89db
1 changed files with 3 additions and 0 deletions
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arch/s390/kernel/debug.c
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@ -823,6 +823,9 @@ ssize_t debug_dump(debug_info_t *id, struct debug_view *view,
file_private_info_t *p_info;
size_t size, offset = 0;
if (!id)
return -EINVAL;
/* Need space for '\0' byte */
if (buf_size < 1)
return 0;