From: Marijn Suijten marijn.suijten@somainline.org
stable inclusion from stable-v5.10.94 commit 09aed85e8c983b0e6bfaafb7fdccdc90d4b058ea bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit e29e24bdabfeddbf8b1a4ecac1af439a85150438 ]
of_property_read_u32_array takes the number of elements to read as last argument. This does not always need to be 4 (sizeof(u32)) but should instead be the size of the array in DT as read just above with of_property_count_elems_of_size.
To not make such an error go unnoticed again the driver now bails accordingly when of_property_read_u32_array returns an error. Surprisingly the indentation of newlined arguments is lining up again after prepending `rc = `.
Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3") Signed-off-by: Marijn Suijten marijn.suijten@somainline.org Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@somainline.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org Signed-off-by: Lee Jones lee.jones@linaro.org Link: https://lore.kernel.org/r/20211115203459.1634079-3-marijn.suijten@somainline... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/video/backlight/qcom-wled.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 2c4290f08202..92df5a9f6ae5 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -1535,10 +1535,15 @@ static int wled_configure(struct wled *wled) return -EINVAL; }
- of_property_read_u32_array(dev->of_node, + rc = of_property_read_u32_array(dev->of_node, "qcom,enabled-strings", wled->cfg.enabled_strings, - sizeof(u32)); + string_len); + if (rc) { + dev_err(dev, "Failed to read %d elements from qcom,enabled-strings: %d\n", + string_len, rc); + return rc; + }
for (i = 0; i < string_len; ++i) { if (wled->cfg.enabled_strings[i] >= wled->max_string_count) {