6.12-stable review patch. If anyone has any objections, please let me know.
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From: Shang song (Lenovo) shangsong2@foxmail.com
[ Upstream commit 311942ce763e21dacef7e53996d5a1e19b8adab1 ]
If handler_address or mapped VA is NULL, the related buffer address and VA can be ignored, so make acpi_parse_prmt() skip the current handler in those cases.
Signed-off-by: Shang song (Lenovo) shangsong2@foxmail.com Link: https://patch.msgid.link/20250826030229.834901-1-shangsong2@foxmail.com [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/prmt.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c index be033bbb126a4..6792d4385eee4 100644 --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -150,15 +150,28 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end) th = &tm->handlers[cur_handler];
guid_copy(&th->guid, (guid_t *)handler_info->handler_guid); + + /* + * Print an error message if handler_address is NULL, the parse of VA also + * can be skipped. + */ + if (unlikely(!handler_info->handler_address)) { + pr_info("Skipping handler with NULL address for GUID: %pUL", + (guid_t *)handler_info->handler_guid); + continue; + } + th->handler_addr = (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address); /* - * Print a warning message if handler_addr is zero which is not expected to - * ever happen. + * Print a warning message and skip the parse of VA if handler_addr is zero + * which is not expected to ever happen. */ - if (unlikely(!th->handler_addr)) + if (unlikely(!th->handler_addr)) { pr_warn("Failed to find VA of handler for GUID: %pUL, PA: 0x%llx", &th->guid, handler_info->handler_address); + continue; + }
th->static_data_buffer_addr = efi_pa_va_lookup(&th->guid, handler_info->static_data_buffer_address);