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| author | Hermes Wu <Hermes.wu@ite.com.tw> | 2025-01-21 15:01:51 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:33:32 +0200 |
| commit | e713b514d2709249e8d6a573f07c2b0081804b94 (patch) | |
| tree | 1ab6a5e02ae4a042f42a515c287ba7f1da921b04 /drivers | |
| parent | 21daa13f7b643228703b56d029064ed72c04f116 (diff) | |
| download | linux-e713b514d2709249e8d6a573f07c2b0081804b94.tar.gz linux-e713b514d2709249e8d6a573f07c2b0081804b94.tar.bz2 linux-e713b514d2709249e8d6a573f07c2b0081804b94.zip | |
drm/bridge: it6505: fix HDCP V match check is not performed correctly
[ Upstream commit a5072fc77fb9e38fa9fd883642c83c3720049159 ]
Fix a typo where V compare incorrectly compares av[] with av[] itself,
which can result in HDCP failure.
The loop of V compare is expected to iterate for 5 times
which compare V array form av[0][] to av[4][].
It should check loop counter reach the last statement "i == 5"
before return true
Fixes: 0989c02c7a5c ("drm/bridge: it6505: fix HDCP CTS compare V matching")
Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250121-fix-hdcp-v-comp-v4-1-185f45c728dc@ite.com.tw
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/bridge/ite-it6505.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 7c3bd539655b..cc2bf9c14373 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2030,12 +2030,13 @@ static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505) continue; } - for (i = 0; i < 5; i++) { + for (i = 0; i < 5; i++) if (bv[i][3] != av[i][0] || bv[i][2] != av[i][1] || - av[i][1] != av[i][2] || bv[i][0] != av[i][3]) + bv[i][1] != av[i][2] || bv[i][0] != av[i][3]) break; - DRM_DEV_DEBUG_DRIVER(dev, "V' all match!! %d, %d", retry, i); + if (i == 5) { + DRM_DEV_DEBUG_DRIVER(dev, "V' all match!! %d", retry); return true; } } |