[Nouveau] [PATCH] drm/nouveau/pm: Prevent overflow in nouveau_perf_init()

[Emil Velikov]

While parsing the perf table, there is no check if
the num of entries read from the vbios is less than
the currently allocated number.

In case of a buggy vbios this will cause overwriting
of kernel memory, causing aditional problems.

Add a simple check in order to prevent the case

Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
---
 drivers/gpu/drm/nouveau/nouveau_perf.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_perf.c b/drivers/gpu/drm/nouveau/nouveau_perf.c
index f2d98c9..b0e995f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_perf.c
+++ b/drivers/gpu/drm/nouveau/nouveau_perf.c
@@ -225,6 +225,11 @@ nouveau_perf_init(struct drm_device *dev)
 		entries   = perf[2];
 	}
 
+	if (entries > NOUVEAU_PM_MAX_LEVEL) {
+		NV_DEBUG(dev, "perf table has too many entries - buggy vbios?\n");
+		entries = NOUVEAU_PM_MAX_LEVEL;
+	}
+
 	entry = perf + headerlen;
 	for (i = 0; i < entries; i++) {
 		struct nouveau_pm_level *perflvl = &pm->perflvl[pm->nr_perflvl];
-- 
1.7.1