drm/nouveau/bios/bitP: check that table is long enough for optional pointers

Fixes OOB VBIOS accesses on some boards.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

5 files changed, 5 insertions, 5 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/boost.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/boost.c
index eaf74eb72983..8ab896dd4e92 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/boost.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/boost.c
@@ -33,7 +33,7 @@ nvbios_boostTe(struct nvkm_bios *bios,
         u32 boost = 0;
 
         if (!bit_entry(bios, 'P', &bit_P)) {
-                if (bit_P.version == 2)
+                if (bit_P.version == 2 && bit_P.length >= 0x34)
                         boost = nvbios_rd32(bios, bit_P.offset + 0x30);
 
                 if (boost) {
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/cstep.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/cstep.c
index 5063382d8a6c..7c8c36054f71 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/cstep.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/cstep.c
@@ -33,7 +33,7 @@ nvbios_cstepTe(struct nvkm_bios *bios,
         u32 cstep = 0;
 
         if (!bit_entry(bios, 'P', &bit_P)) {
-                if (bit_P.version == 2)
+                if (bit_P.version == 2 && bit_P.length >= 0x38)
                         cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
 
                 if (cstep) {
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/fan.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/fan.c
index 456f9ea920dc..0dfb15a27e4e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/fan.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/fan.c
@@ -32,7 +32,7 @@ nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
         u32 fan = 0;
 
         if (!bit_entry(bios, 'P', &bit_P)) {
-                if (bit_P.version == 2 && bit_P.length >= 0x5a)
+                if (bit_P.version == 2 && bit_P.length >= 0x5c)
                         fan = nvbios_rd32(bios, bit_P.offset + 0x58);
 
                 if (fan) {
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
index 617bfffce4ad..03d2f970a29f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
@@ -33,7 +33,7 @@ nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
         u32 power_budget;
 
         if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
-            bit_P.length < 0x2c)
+            bit_P.length < 0x30)
                 return 0;
 
         power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c
index f199270163d2..20b6fc8243e0 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c
@@ -31,7 +31,7 @@ nvbios_vpstate_offset(struct nvkm_bios *b)
         struct bit_entry bit_P;
 
         if (!bit_entry(b, 'P', &bit_P)) {
-                if (bit_P.version == 2)
+                if (bit_P.version == 2 && bit_P.length >= 0x3c)
                         return nvbios_rd32(b, bit_P.offset + 0x38);
         }