6.1-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
[ Upstream commit 82a0a3e6f8c02b3236b55e784a083fa4ee07c321 ]
My static checker rule complains about this code. The concern is that if "sample_space" is negative then the "sample_space >= runtime->channels" condition will not work as intended because it will be type promoted to a high unsigned int value.
strm->fifo_sample_size is SSI_FIFO_DEPTH (32). The SSIFSR_TDC_MASK is 0x3f. Without any further context it does seem like a reasonable warning and it can't hurt to add a check for negatives.
Cc: stable@vger.kernel.org Fixes: 03e786bd4341 ("ASoC: sh: Add RZ/G2L SSIF-2 driver") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Reviewed-by: Geert Uytterhoeven geert+renesas@glider.be Link: https://patch.msgid.link/e07c3dc5-d885-4b04-a742-71f42243f4fd@stanley.mounta... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/sh/rz-ssi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index 468050467bb39..12e063c29a2ab 100644 --- a/sound/soc/sh/rz-ssi.c +++ b/sound/soc/sh/rz-ssi.c @@ -483,6 +483,8 @@ static int rz_ssi_pio_send(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) sample_space = strm->fifo_sample_size; ssifsr = rz_ssi_reg_readl(ssi, SSIFSR); sample_space -= (ssifsr >> SSIFSR_TDC_SHIFT) & SSIFSR_TDC_MASK; + if (sample_space < 0) + return -EINVAL;
/* Only add full frames at a time */ while (frames_left && (sample_space >= runtime->channels)) {