From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
CEA-861 says :
"d = offset for the byte following the reserved data block.
If no data is provided in the reserved data block, then d=4.
If no DTDs are provided, then d=0."
So let's not look for DTDs when d==0. In fact let's just make that
<4 since those values would just mean that he DTDs overlap the block
header. And let's also check that d isn't so big as to declare
the descriptors to live past the block end, although the code
does already survive that case as we'd just end up with a negative
number of descriptors and the loop would not do anything.
Cc: Allen Chen <allen.chen@xxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 99769d6c9f84..1b6e544cf5c7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2201,10 +2201,13 @@ typedef void detailed_cb(struct detailed_timing *timing, void *closure);
static void
cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
{
- int i, n = 0;
+ int i, n;
u8 d = ext[0x02];
u8 *det_base = ext + d;
+ if (d < 4 || d > 127)
+ return;
+
n = (127 - d) / 18;
for (i = 0; i < n; i++)
cb((struct detailed_timing *)(det_base + 18 * i), closure);
--
2.24.1
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