From 32865e3e010f0ea81e518878e9a6b1492ff07281 Mon Sep 17 00:00:00 2001 From: Lenny Szubowicz Date: Thu, 2 May 2019 16:00:52 -0400 Subject: [PATCH] ACPI / LPIT: Correct LPIT end address for lpit_process() Correct the LPIT end address which is passed into lpit_process() and the end address limit test in lpit_process(). The LPI state descriptor subtables follow the fixed sized acpi_lpit_header up to the end of the LPIT. The last LPI state descriptor can end at exactly the end of the LPIT. Note that this is a fix to a latent problem. Although incorrect, the unpatched version works because the passed in end address is just slightly beyond the actual end of the LPIT and the size of the ACPI LPIT header is smaller than the size of the only currently defined LPI state descriptor, acpi_lpit_native. Signed-off-by: Lenny Szubowicz Reviewed-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpi_lpit.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c index e43cb71b6972..8b170a07908a 100644 --- a/drivers/acpi/acpi_lpit.c +++ b/drivers/acpi/acpi_lpit.c @@ -137,7 +137,7 @@ static void lpit_update_residency(struct lpit_residency_info *info, static void lpit_process(u64 begin, u64 end) { - while (begin + sizeof(struct acpi_lpit_native) < end) { + while (begin + sizeof(struct acpi_lpit_native) <= end) { struct acpi_lpit_native *lpit_native = (struct acpi_lpit_native *)begin; if (!lpit_native->header.type && !lpit_native->header.flags) { @@ -156,7 +156,6 @@ static void lpit_process(u64 begin, u64 end) void acpi_init_lpit(void) { acpi_status status; - u64 lpit_begin; struct acpi_table_lpit *lpit; status = acpi_get_table(ACPI_SIG_LPIT, 0, (struct acpi_table_header **)&lpit); @@ -164,6 +163,6 @@ void acpi_init_lpit(void) if (ACPI_FAILURE(status)) return; - lpit_begin = (u64)lpit + sizeof(*lpit); - lpit_process(lpit_begin, lpit_begin + lpit->header.length); + lpit_process((u64)lpit + sizeof(*lpit), + (u64)lpit + lpit->header.length); }