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ACPI: tables: handle failed initrd override mappings

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The runtime AML table-loading path can invoke initrd override after
permanent mappings are enabled. Mapping bookkeeping can then fail.

Return AE_NO_MEMORY in that case to prevent a NULL pointer dereference
when attempting to read the table length.

Detected by static analysis and reviewed with AI-assisted source auditing.

Fixes: b2a35003df ("ACPI: Implement physical address table override")
Assisted-by: LLM
Signed-off-by: Slavin Liu <bolin.liu@seu.edu.cn>
[ rjw: Added empty code line after conditional, changelog edits ]
Link: https://patch.msgid.link/20260913125123.109803-1-bolin.liu@seu.edu.cn
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Slavin Liu 2026-09-13 20:51:23 +08:00 committed by Rafael J. Wysocki
parent 72a35790da
commit 047c834d93
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/tables.c
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@ -560,6 +560,9 @@ acpi_table_initrd_override(struct acpi_table_header *existing_table,
while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
ACPI_HEADER_SIZE);
if (!table)
return AE_NO_MEMORY;
if (table_offset + table->length > all_tables_size) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
WARN_ON(1);