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

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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);
}