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i2c: qcom-cci: don't put a device tree node before i2c_add_adapter()

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There is a minor chance for a race, if a pointer to an i2c-bus subnode
is stored and then reused after releasing its reference, and it would
be sufficient to get one more reference under a loop over children
subnodes.

Fixes: e517526195 ("i2c: Add Qualcomm CCI I2C driver")
Signed-off-by: Vladimir Zapolskiy <[email protected]>
Reviewed-by: Robert Foss <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Vladimir Zapolskiy authored and Wolfram Sang committed 2022-02-11 18:43:08 +01:00
1 parent a0d48505a1
commit 02a4a69667
1 file changed
+10 -4
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drivers/i2c/busses/i2c-qcom-cci.c
+10 -4
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@@ -558,7 +558,7 @@ static int cci_probe(struct platform_device *pdev)
cci->master[idx].adap.quirks = &cci->data->quirks;
cci->master[idx].adap.algo = &cci_algo;
cci->master[idx].adap.dev.parent = dev;
cci->master[idx].adap.dev.of_node = child;
cci->master[idx].adap.dev.of_node = of_node_get(child);
cci->master[idx].master = idx;
cci->master[idx].cci = cci;
@@ -643,8 +643,10 @@ static int cci_probe(struct platform_device *pdev)
continue;
ret = i2c_add_adapter(&cci->master[i].adap);
if (ret < 0)
if (ret < 0) {
of_node_put(cci->master[i].adap.dev.of_node);
goto error_i2c;
}
}
pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
@@ -656,8 +658,10 @@ static int cci_probe(struct platform_device *pdev)
error_i2c:
for (--i ; i >= 0; i--) {
if (cci->master[i].cci)
if (cci->master[i].cci) {
i2c_del_adapter(&cci->master[i].adap);
of_node_put(cci->master[i].adap.dev.of_node);
}
}
error:
disable_irq(cci->irq);
@@ -673,8 +677,10 @@ static int cci_remove(struct platform_device *pdev)
int i;
for (i = 0; i < cci->data->num_masters; i++) {
if (cci->master[i].cci)
if (cci->master[i].cci) {
i2c_del_adapter(&cci->master[i].adap);
of_node_put(cci->master[i].adap.dev.of_node);
}
cci_halt(cci, i);
}