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| author |   Takashi Iwai <tiwai@suse.de> | 2018-07-17 23:12:33 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-07-18 07:47:57 +0200 |
| commit | ef4db239cda2d74f53120e223643b0f5bbf947c1 (patch) | |
| tree | e1c2a5dd6dc2f7b6433f9785dcd57905817ee735 /sound/core | |
| parent | ALSA: rawmidi: Minor code refactoring (diff) | |
| download | linux-dev-ef4db239cda2d74f53120e223643b0f5bbf947c1.tar.xz linux-dev-ef4db239cda2d74f53120e223643b0f5bbf947c1.zip | |
ALSA: rawmidi: Use kvmalloc() for buffers
The size of in-kernel rawmidi buffers may be big up to 1MB, and it can
be specified freely by user-space; which implies that user-space may
trigger kmalloc() errors frequently.
This patch replaces the buffer allocation via kvmalloc() for dealing
with bigger buffers gracefully.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/rawmidi.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index cc944a3637a2..69517e18ef07 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -29,6 +29,7 @@ #include <linux/mutex.h> #include <linux/module.h> #include <linux/delay.h> +#include <linux/mm.h> #include <sound/rawmidi.h> #include <sound/info.h> #include <sound/control.h> @@ -128,7 +129,7 @@ static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) runtime->avail = 0; else runtime->avail = runtime->buffer_size; - runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL); + runtime->buffer = kvmalloc(runtime->buffer_size, GFP_KERNEL); if (!runtime->buffer) { kfree(runtime); return -ENOMEM; @@ -142,7 +143,7 @@ static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) { struct snd_rawmidi_runtime *runtime = substream->runtime; - kfree(runtime->buffer); + kvfree(runtime->buffer); kfree(runtime); substream->runtime = NULL; return 0; @@ -654,7 +655,7 @@ static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime, if (params->avail_min < 1 || params->avail_min > params->buffer_size) return -EINVAL; if (params->buffer_size != runtime->buffer_size) { - newbuf = kmalloc(params->buffer_size, GFP_KERNEL); + newbuf = kvmalloc(params->buffer_size, GFP_KERNEL); if (!newbuf) return -ENOMEM; spin_lock_irq(&runtime->lock); @@ -663,7 +664,7 @@ static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime, runtime->buffer_size = params->buffer_size; __reset_runtime_ptrs(runtime, is_input); spin_unlock_irq(&runtime->lock); - kfree(oldbuf); + kvfree(oldbuf); } runtime->avail_min = params->avail_min; return 0; |