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Subject[PATCH 8/8, retry] sound/soc: introduce missing kfree
From: Julia Lawall <julia@diku.dk>

Error handling code following a kzalloc should free the allocated data.
Error handling code following an ioremap should iounmap the allocated data.

The semantic match that finds the first problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
when != if (...) { <+...x...+> }
(
x->f1 = E
|
(x->f1 == NULL || ...)
|
f(...,x->f1,...)
)
...>
(
return \(0\|<+...x...+>\|ptr\);
|
return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
---
sound/soc/fsl/mpc5200_dma.c | 33 ++++++++++++--------
1 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/var/linuxes/linux-next/sound/soc/fsl/mpc5200_dma.c b/var/julia/linuxcopy/sound/soc/fsl/mpc5200_dma.c
index 9ff62e3..6096d22 100644
--- a/var/linuxes/linux-next/sound/soc/fsl/mpc5200_dma.c
+++ b/var/julia/linuxcopy/sound/soc/fsl/mpc5200_dma.c
@@ -447,6 +447,7 @@ int mpc5200_audio_dma_create(struct of_device *op)
int size, irq, rc;
const __be32 *prop;
void __iomem *regs;
+ int ret;

/* Fetch the registers and IRQ of the PSC */
irq = irq_of_parse_and_map(op->node, 0);
@@ -463,14 +464,16 @@ int mpc5200_audio_dma_create(struct of_device *op)
/* Allocate and initialize the driver private data */
psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
if (!psc_dma) {
- iounmap(regs);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_unmap;
}

/* Get the PSC ID */
prop = of_get_property(op->node, "cell-index", &size);
- if (!prop || size < sizeof *prop)
- return -ENODEV;
+ if (!prop || size < sizeof *prop) {
+ ret = -ENODEV;
+ goto out_free;
+ }

spin_lock_init(&psc_dma->lock);
mutex_init(&psc_dma->mutex);
@@ -493,9 +496,8 @@ int mpc5200_audio_dma_create(struct of_device *op)
if (!psc_dma->capture.bcom_task ||
!psc_dma->playback.bcom_task) {
dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
- iounmap(regs);
- kfree(psc_dma);
- return -ENODEV;
+ ret = -ENODEV;
+ goto out_free;
}

/* Disable all interrupts and reset the PSC */
@@ -537,12 +539,8 @@ int mpc5200_audio_dma_create(struct of_device *op)
&psc_dma_bcom_irq_tx, IRQF_SHARED,
"psc-dma-playback", &psc_dma->playback);
if (rc) {
- free_irq(psc_dma->irq, psc_dma);
- free_irq(psc_dma->capture.irq,
- &psc_dma->capture);
- free_irq(psc_dma->playback.irq,
- &psc_dma->playback);
- return -ENODEV;
+ ret = -ENODEV;
+ goto out_irq;
}

/* Save what we've done so it can be found again later */
@@ -550,6 +548,15 @@ int mpc5200_audio_dma_create(struct of_device *op)

/* Tell the ASoC OF helpers about it */
return snd_soc_register_platform(&mpc5200_audio_dma_platform);
+out_irq:
+ free_irq(psc_dma->irq, psc_dma);
+ free_irq(psc_dma->capture.irq, &psc_dma->capture);
+ free_irq(psc_dma->playback.irq, &psc_dma->playback);
+out_free:
+ kfree(psc_dma);
+out_unmap:
+ iounmap(regs);
+ return ret;
}
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);


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