[PATCH] clk: qcom: rcg2: validate frequency table entry in __clk_rcg2_shared_set_rate()

[Gabor Juhos]

Commit aec8c0e28ce4 ("clk: qcom: rcg2: add clk_rcg2_shared_floor_ops")
removed validating of the frequency table entry pointer returned by the
qcom_find_freq() or the qcom_find_freq_floor() functions.

Since both functions can return NULL and the pointer is passed directly
to the __clk_rcg2_configure() function where it gets dereferenced
unconditionally, it could cause a panic.

Restore the sanity check removed by the mentioned commit in order to avoid
a possible NULL pointer dereference.

Compile tested only.

Fixes: aec8c0e28ce4 ("clk: qcom: rcg2: add clk_rcg2_shared_floor_ops")
Signed-off-by: Gabor Juhos <j4g8y7@xxxxxxxxx>
---
 drivers/clk/qcom/clk-rcg2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index d7914e59129f..260e90f53461 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -1385,6 +1385,9 @@ static int __clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
 		return -EINVAL;
 	}
 
+	if (!f)
+		return -EINVAL;
+
 	/*
 	 * In case clock is disabled, update the M, N and D registers, cache
 	 * the CFG value in parked_cfg and don't hit the update bit of CMD

---
base-commit: 55981579b27b6541aeeab81c768f248dba0491ac
change-id: 20261027-rcg2-avoid-null-ptr-deref-0885433584af

Best regards,
-- 
Gabor Juhos <j4g8y7@xxxxxxxxx>