4.14-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Meskhidze konstantin.meskhidze@huawei.com
[ Upstream commit dd05484f99d16715a88eedfca363828ef9a4c2d4 ]
Buffer 'afmt_status' of size 6 could overflow, since index 'afmt_idx' is checked after access.
Fixes: 5cc4e5fc293b ("drm/radeon: Cleanup HDMI audio interrupt handling for evergreen") Co-developed-by: Ivanov Mikhail ivanov.mikhail1@huawei-partners.com Signed-off-by: Konstantin Meskhidze konstantin.meskhidze@huawei.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/radeon/evergreen.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c index 24fe66c89dfb0..1f8d5658a5b85 100644 --- a/drivers/gpu/drm/radeon/evergreen.c +++ b/drivers/gpu/drm/radeon/evergreen.c @@ -4814,14 +4814,15 @@ int evergreen_irq_process(struct radeon_device *rdev) break; case 44: /* hdmi */ afmt_idx = src_data; - if (!(afmt_status[afmt_idx] & AFMT_AZ_FORMAT_WTRIG)) - DRM_DEBUG("IH: IH event w/o asserted irq bit?\n"); - if (afmt_idx > 5) { DRM_ERROR("Unhandled interrupt: %d %d\n", src_id, src_data); break; } + + if (!(afmt_status[afmt_idx] & AFMT_AZ_FORMAT_WTRIG)) + DRM_DEBUG("IH: IH event w/o asserted irq bit?\n"); + afmt_status[afmt_idx] &= ~AFMT_AZ_FORMAT_WTRIG; queue_hdmi = true; DRM_DEBUG("IH: HDMI%d\n", afmt_idx + 1);