Commit f1c9472e authored by Takashi Iwai's avatar Takashi Iwai Committed by Sasha Levin

ALSA: seq: Fix racy cell insertions during snd_seq_pool_done()

[ Upstream commit c520ff3d ]

When snd_seq_pool_done() is called, it marks the closing flag to
refuse the further cell insertions.  But snd_seq_pool_done() itself
doesn't clear the cells but just waits until all cells are cleared by
the caller side.  That is, it's racy, and this leads to the endless
stall as syzkaller spotted.

This patch addresses the racy by splitting the setup of pool->closing
flag out of snd_seq_pool_done(), and calling it properly before
snd_seq_pool_done().

BugLink: http://lkml.kernel.org/r/CACT4Y+aqqy8bZA1fFieifNxR2fAfFQQABcBHj801+u5ePV0URw@mail.gmail.comReported-and-tested-by: default avatarDmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent d57b1afa
...@@ -1921,6 +1921,7 @@ static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, ...@@ -1921,6 +1921,7 @@ static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
info.output_pool != client->pool->size)) { info.output_pool != client->pool->size)) {
if (snd_seq_write_pool_allocated(client)) { if (snd_seq_write_pool_allocated(client)) {
/* remove all existing cells */ /* remove all existing cells */
snd_seq_pool_mark_closing(client->pool);
snd_seq_queue_client_leave_cells(client->number); snd_seq_queue_client_leave_cells(client->number);
snd_seq_pool_done(client->pool); snd_seq_pool_done(client->pool);
} }
......
...@@ -70,6 +70,9 @@ void snd_seq_fifo_delete(struct snd_seq_fifo **fifo) ...@@ -70,6 +70,9 @@ void snd_seq_fifo_delete(struct snd_seq_fifo **fifo)
return; return;
*fifo = NULL; *fifo = NULL;
if (f->pool)
snd_seq_pool_mark_closing(f->pool);
snd_seq_fifo_clear(f); snd_seq_fifo_clear(f);
/* wake up clients if any */ /* wake up clients if any */
......
...@@ -414,6 +414,18 @@ int snd_seq_pool_init(struct snd_seq_pool *pool) ...@@ -414,6 +414,18 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
return 0; return 0;
} }
/* refuse the further insertion to the pool */
void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
{
unsigned long flags;
if (snd_BUG_ON(!pool))
return;
spin_lock_irqsave(&pool->lock, flags);
pool->closing = 1;
spin_unlock_irqrestore(&pool->lock, flags);
}
/* remove events */ /* remove events */
int snd_seq_pool_done(struct snd_seq_pool *pool) int snd_seq_pool_done(struct snd_seq_pool *pool)
{ {
...@@ -424,10 +436,6 @@ int snd_seq_pool_done(struct snd_seq_pool *pool) ...@@ -424,10 +436,6 @@ int snd_seq_pool_done(struct snd_seq_pool *pool)
return -EINVAL; return -EINVAL;
/* wait for closing all threads */ /* wait for closing all threads */
spin_lock_irqsave(&pool->lock, flags);
pool->closing = 1;
spin_unlock_irqrestore(&pool->lock, flags);
if (waitqueue_active(&pool->output_sleep)) if (waitqueue_active(&pool->output_sleep))
wake_up(&pool->output_sleep); wake_up(&pool->output_sleep);
...@@ -484,6 +492,7 @@ int snd_seq_pool_delete(struct snd_seq_pool **ppool) ...@@ -484,6 +492,7 @@ int snd_seq_pool_delete(struct snd_seq_pool **ppool)
*ppool = NULL; *ppool = NULL;
if (pool == NULL) if (pool == NULL)
return 0; return 0;
snd_seq_pool_mark_closing(pool);
snd_seq_pool_done(pool); snd_seq_pool_done(pool);
kfree(pool); kfree(pool);
return 0; return 0;
......
...@@ -84,6 +84,7 @@ static inline int snd_seq_total_cells(struct snd_seq_pool *pool) ...@@ -84,6 +84,7 @@ static inline int snd_seq_total_cells(struct snd_seq_pool *pool)
int snd_seq_pool_init(struct snd_seq_pool *pool); int snd_seq_pool_init(struct snd_seq_pool *pool);
/* done pool - free events */ /* done pool - free events */
void snd_seq_pool_mark_closing(struct snd_seq_pool *pool);
int snd_seq_pool_done(struct snd_seq_pool *pool); int snd_seq_pool_done(struct snd_seq_pool *pool);
/* create pool */ /* create pool */
......
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