drm/amd/display: add a NULL pointer check
[Why & How] We have to check if stream is properly initialized before calling find_matching_pll(), otherwise we might end up trying to deferecence a NULL pointer. Cc: stable@vger.kernel.org # 6.1+ Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com> Signed-off-by: Sung-huai Wang <danny.wang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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@ -974,10 +974,12 @@ enum dc_status resource_map_phy_clock_resources(
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|| dc_is_virtual_signal(pipe_ctx->stream->signal))
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pipe_ctx->clock_source =
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dc->res_pool->dp_clock_source;
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else
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pipe_ctx->clock_source = find_matching_pll(
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&context->res_ctx, dc->res_pool,
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stream);
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else {
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if (stream && stream->link && stream->link->link_enc)
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pipe_ctx->clock_source = find_matching_pll(
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&context->res_ctx, dc->res_pool,
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stream);
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}
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if (pipe_ctx->clock_source == NULL)
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return DC_NO_CLOCK_SOURCE_RESOURCE;
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