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netconsole: Warn if MAX_USERDATA_ITEMS limit is exceeded

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netconsole configfs helpers doesn't allow the creation of more than
MAX_USERDATA_ITEMS items.

Add a warning when netconsole userdata update function attempts sees
more than MAX_USERDATA_ITEMS entries.

Replace silent ignore mechanism with WARN_ON_ONCE() to highlight
potential misuse during development and debugging.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250108-netcons_overflow_test-v3-1-3d85eb091bec@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Breno Leitao
2025-01-08 03:50:25 -08:00
committed by Jakub Kicinski
parent 14ea4cd1b1
commit e51c7478d2
1 changed files with 1 additions and 1 deletions
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2
drivers/net/netconsole.c
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@@ -730,7 +730,7 @@ static void update_userdata(struct netconsole_target *nt)
struct userdatum *udm_item;
struct config_item *item;
if (child_count >= MAX_USERDATA_ITEMS)
if (WARN_ON_ONCE(child_count >= MAX_USERDATA_ITEMS))
break;
child_count++;