diff options
| author | Suraj Sonawane <surajsonawane0215@gmail.com> | 2024-11-02 18:06:30 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-11-05 12:53:28 +0000 |
| commit | 28f7aa0c015036db260adbec37891984a31ed4c2 (patch) | |
| tree | 9cf933a6261c6caf4d9a878f6541411fd9894876 /sound/soc/bcm | |
| parent | 1157733344651ca505e259d6554591ff156922fa (diff) | |
ASoC: bcm63xx-pcm-whistler: fix uninit-value in i2s_dma_isr
Fix an issue detected by the Smatch tool:
sound/soc/bcm/bcm63xx-pcm-whistler.c:264 i2s_dma_isr()
error: uninitialized symbol 'val_1'.
sound/soc/bcm/bcm63xx-pcm-whistler.c:264 i2s_dma_isr()
error: uninitialized symbol 'val_2'.
These errors were triggered because the variables 'val_1' and 'val_2'
could remain uninitialized if 'offlevel' is zero, meaning the loop
that assigns values to them does not execute. In this case,
'dma_addr_next' would use uninitialized data, potentially leading
to undefined behavior.
To resolve this, a conditional update for 'dma_addr_next' is added,
ensuring it is assigned only when 'val_1' and 'val_2' are read.
A new boolean variable 'val_read' flags when the values have been
retrieved, setting 'dma_addr_next' only if valid data is available.
This solution prevents the use of uninitialized data, maintaining
defined behavior for 'dma_addr_next' in all cases, and aligns with
expected usage of I2S RX descriptor data.
Signed-off-by: Suraj Sonawane <surajsonawane0215@gmail.com>
Link: https://patch.msgid.link/20241102123630.25446-1-surajsonawane0215@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/bcm')
| -rw-r--r-- | sound/soc/bcm/bcm63xx-pcm-whistler.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sound/soc/bcm/bcm63xx-pcm-whistler.c b/sound/soc/bcm/bcm63xx-pcm-whistler.c index 018f2372e892..e3a4fcc63a56 100644 --- a/sound/soc/bcm/bcm63xx-pcm-whistler.c +++ b/sound/soc/bcm/bcm63xx-pcm-whistler.c @@ -256,12 +256,16 @@ static irqreturn_t i2s_dma_isr(int irq, void *bcm_i2s_priv) offlevel = (int_status & I2S_RX_DESC_OFF_LEVEL_MASK) >> I2S_RX_DESC_OFF_LEVEL_SHIFT; + bool val_read = false; while (offlevel) { regmap_read(regmap_i2s, I2S_RX_DESC_OFF_ADDR, &val_1); regmap_read(regmap_i2s, I2S_RX_DESC_OFF_LEN, &val_2); + val_read = true; offlevel--; } - prtd->dma_addr_next = val_1 + val_2; + if (val_read) + prtd->dma_addr_next = val_1 + val_2; + ifflevel = (int_status & I2S_RX_DESC_IFF_LEVEL_MASK) >> I2S_RX_DESC_IFF_LEVEL_SHIFT; |