From 43e229a52b464099afa9449aef587b9a3419b470 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Tue, 2 Feb 2021 17:52:53 -0500 Subject: [PATCH] acpi: use constants as strncpy limit MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit gcc is not smart enough to figure out length was validated before use as strncpy limit, resulting in this warning: inlined from ‘virt_set_oem_table_id’ at ../../hw/arm/virt.c:2197:5: /usr/include/aarch64-linux-gnu/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound depends on the length of the source argument [-Werror=stringop-overflow=] Simplify things by using a constant limit instead. Fixes: 97fc5d507fca ("acpi: Permit OEM ID and OEM table ID fields to be changed") Signed-off-by: Michael S. Tsirkin --- hw/arm/virt.c | 4 ++-- hw/i386/microvm.c | 4 ++-- hw/i386/pc.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 0c65fe38a0..371147f3ae 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -2173,7 +2173,7 @@ static void virt_set_oem_id(Object *obj, const char *value, Error **errp) return; } - strncpy(vms->oem_id, value, len + 1); + strncpy(vms->oem_id, value, 6); } static char *virt_get_oem_table_id(Object *obj, Error **errp) @@ -2194,7 +2194,7 @@ static void virt_set_oem_table_id(Object *obj, const char *value, "User specified oem-table-id value is bigger than 8 bytes in size"); return; } - strncpy(vms->oem_table_id, value, len + 1); + strncpy(vms->oem_table_id, value, 8); } diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c index 1dc2956e72..4e0cf4c522 100644 --- a/hw/i386/microvm.c +++ b/hw/i386/microvm.c @@ -668,7 +668,7 @@ static void microvm_machine_set_oem_id(Object *obj, const char *value, return; } - strncpy(mms->oem_id, value, len + 1); + strncpy(mms->oem_id, value, 6); } static char *microvm_machine_get_oem_table_id(Object *obj, Error **errp) @@ -690,7 +690,7 @@ static void microvm_machine_set_oem_table_id(Object *obj, const char *value, "8 bytes in size"); return; } - strncpy(mms->oem_table_id, value, len + 1); + strncpy(mms->oem_table_id, value, 8); } static void microvm_machine_initfn(Object *obj) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 437977c49e..8aa85dec54 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1630,7 +1630,7 @@ static void pc_machine_set_oem_id(Object *obj, const char *value, Error **errp) return; } - strncpy(pcms->oem_id, value, len + 1); + strncpy(pcms->oem_id, value, 6); } static char *pc_machine_get_oem_table_id(Object *obj, Error **errp) @@ -1652,7 +1652,7 @@ static void pc_machine_set_oem_table_id(Object *obj, const char *value, "8 bytes in size"); return; } - strncpy(pcms->oem_table_id, value, len + 1); + strncpy(pcms->oem_table_id, value, 8); } static void pc_machine_initfn(Object *obj) -- 2.30.2