On Fri, 15 Oct 2010, walter harms wrote: > This looks like a case for kasprintf(). OK, I will take a look at it. julia > re > wh > > Julia Lawall schrieb: > > From: Julia Lawall <julia@xxxxxxx> > > > > Each of these functions defines a variable err and a variable retval. err > > is always 0 and is returned in the error case. At one point near the end > > of the function, retval is initialized to an error code. For each > > function, the patch drops err, stores -ENOMEM in retval in two cases where > > memory allocation fails, and changes the return value in the error case > > from err to retval. > > > > A simplified version of the semantic match that finds this problem is as > > follows: (http://coccinelle.lip6.fr/) > > > > // <smpl> > > @@ > > expression ret; > > expression x,e1,e2,e3; > > @@ > > > > ret = 0 > > ... when != ret = e1 > > *x = \(kmalloc\|kcalloc\|kzalloc\)(...) > > ... when != ret = e2 > > if (x == NULL) { ... when != ret = e3 > > return ret; > > } > > // </smpl> > > > > Signed-off-by: Julia Lawall <julia@xxxxxxx> > > > > --- > > drivers/staging/cx25821/cx25821-audio-upstream.c | 11 +++++++---- > > drivers/staging/cx25821/cx25821-video-upstream-ch2.c | 11 +++++++---- > > drivers/staging/cx25821/cx25821-video-upstream.c | 11 +++++++---- > > 3 files changed, 21 insertions(+), 12 deletions(-) > > > > diff -u -p a/drivers/staging/cx25821/cx25821-audio-upstream.c b/drivers/staging/cx25821/cx25821-audio-upstream.c > > --- a/drivers/staging/cx25821/cx25821-audio-upstream.c > > +++ b/drivers/staging/cx25821/cx25821-audio-upstream.c > > @@ -723,7 +723,6 @@ int cx25821_audio_upstream_init(struct c > > { > > struct sram_channel *sram_ch; > > int retval = 0; > > - int err = 0; > > int str_length = 0; > > > > if (dev->_audio_is_running) { > > @@ -756,8 +755,10 @@ int cx25821_audio_upstream_init(struct c > > str_length = strlen(dev->input_audiofilename); > > dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_audiofilename) > > + if (!dev->_audiofilename) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_audiofilename, dev->input_audiofilename, > > str_length + 1); > > @@ -770,8 +771,10 @@ int cx25821_audio_upstream_init(struct c > > str_length = strlen(_defaultAudioName); > > dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_audiofilename) > > + if (!dev->_audiofilename) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1); > > } > > @@ -802,5 +805,5 @@ int cx25821_audio_upstream_init(struct c > > error: > > cx25821_dev_unregister(dev); > > > > - return err; > > + return retval; > > } > > diff -u -p a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > > --- a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > > +++ b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > > @@ -747,7 +747,6 @@ int cx25821_vidupstream_init_ch2(struct > > struct sram_channel *sram_ch; > > u32 tmp; > > int retval = 0; > > - int err = 0; > > int data_frame_size = 0; > > int risc_buffer_size = 0; > > int str_length = 0; > > @@ -792,8 +791,10 @@ int cx25821_vidupstream_init_ch2(struct > > str_length = strlen(dev->input_filename_ch2); > > dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_filename_ch2) > > + if (!dev->_filename_ch2) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_filename_ch2, dev->input_filename_ch2, > > str_length + 1); > > @@ -801,8 +802,10 @@ int cx25821_vidupstream_init_ch2(struct > > str_length = strlen(dev->_defaultname_ch2); > > dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_filename_ch2) > > + if (!dev->_filename_ch2) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_filename_ch2, dev->_defaultname_ch2, > > str_length + 1); > > @@ -851,5 +854,5 @@ int cx25821_vidupstream_init_ch2(struct > > error: > > cx25821_dev_unregister(dev); > > > > - return err; > > + return retval; > > } > > diff -u -p a/drivers/staging/cx25821/cx25821-video-upstream.c b/drivers/staging/cx25821/cx25821-video-upstream.c > > --- a/drivers/staging/cx25821/cx25821-video-upstream.c > > +++ b/drivers/staging/cx25821/cx25821-video-upstream.c > > @@ -800,7 +800,6 @@ int cx25821_vidupstream_init_ch1(struct > > struct sram_channel *sram_ch; > > u32 tmp; > > int retval = 0; > > - int err = 0; > > int data_frame_size = 0; > > int risc_buffer_size = 0; > > int str_length = 0; > > @@ -844,16 +843,20 @@ int cx25821_vidupstream_init_ch1(struct > > str_length = strlen(dev->input_filename); > > dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_filename) > > + if (!dev->_filename) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_filename, dev->input_filename, str_length + 1); > > } else { > > str_length = strlen(dev->_defaultname); > > dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > > > > - if (!dev->_filename) > > + if (!dev->_filename) { > > + retval = -ENOMEM; > > goto error; > > + } > > > > memcpy(dev->_filename, dev->_defaultname, str_length + 1); > > } > > @@ -908,5 +911,5 @@ int cx25821_vidupstream_init_ch1(struct > > error: > > cx25821_dev_unregister(dev); > > > > - return err; > > + return retval; > > } > > -- > > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
