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ALSA: info: Use kvzalloc() for a temporary write buffer 

We used to use kmalloc (more exactly, krealloc()) for creating and
growing the temporary buffer for text proc write.  It can grow up to
16kB, and it's already a bit doubtful whether it's always safe to use
kmalloc().  With the recent addition of kvmalloc(), we can have a
better chance for succeed of memory allocation, so let's switch to
that new API.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-05-22 17:39:13 +02:00
parent c2c86a9717
commit ffb73b08e7
1 changed files with 3 additions and 3 deletions
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6
sound/core/info.c
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@ -344,12 +344,12 @@ static ssize_t snd_info_text_entry_write(struct file *file,
}
}
if (next > buf->len) {
char *nbuf = krealloc(buf->buffer, PAGE_ALIGN(next),
GFP_KERNEL | __GFP_ZERO);
char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
if (!nbuf) {
err = -ENOMEM;
goto error;
}
kvfree(buf->buffer);
buf->buffer = nbuf;
buf->len = PAGE_ALIGN(next);
}
@ -427,7 +427,7 @@ static int snd_info_text_entry_release(struct inode *inode, struct file *file)
single_release(inode, file);
kfree(data->rbuffer);
if (data->wbuffer) {
kfree(data->wbuffer->buffer);
kvfree(data->wbuffer->buffer);
kfree(data->wbuffer);
}