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authorVladimir Zapolskiy <vladimir.zapolskiy@linaro.org>2022-02-03 17:47:03 +0100
committerWolfram Sang <wsa@kernel.org>2022-02-11 18:43:08 +0100
commit02a4a69667a2ad32f3b52ca906f19628fbdd8a01 (patch)
tree459079398d2e68c55460e92722ac47fe948fdd8d
parenti2c: qcom-cci: don't delete an unregistered adapter (diff)
downloadlinux-02a4a69667a2ad32f3b52ca906f19628fbdd8a01.tar.xz
linux-02a4a69667a2ad32f3b52ca906f19628fbdd8a01.zip
i2c: qcom-cci: don't put a device tree node before i2c_add_adapter()
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: e517526195de ("i2c: Add Qualcomm CCI I2C driver") Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> Reviewed-by: Robert Foss <robert.foss@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>
-rw-r--r--drivers/i2c/busses/i2c-qcom-cci.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
index fd4260d18577..cf54f1cb4c57 100644
--- a/drivers/i2c/busses/i2c-qcom-cci.c
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -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);
}