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epoll: fix epoll close error, report by kasan #5846

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merged 1 commit into from
Mar 27, 2022
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epoll: fix epoll close error, report by kasan #5846

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19 changes: 15 additions & 4 deletions fs/vfs/fs_epoll.c
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,16 @@ static const struct file_operations g_epoll_ops =
#endif
};

static struct inode g_epoll_inode =
{
.i_crefs = 1,
.i_flags = FSNODEFLAG_TYPE_DRIVER,
.u =
{
.i_ops = &g_epoll_ops,
},
};
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/****************************************************************************
* Private Functions
****************************************************************************/
Expand All @@ -109,12 +119,12 @@ static FAR struct epoll_head *epoll_head_from_fd(int fd)
return NULL;
}

return (FAR struct epoll_head *)filep->f_inode->i_private;
return (FAR struct epoll_head *)filep->f_priv;
}

static int epoll_do_open(FAR struct file *filep)
{
FAR struct epoll_head *eph = filep->f_inode->i_private;
FAR struct epoll_head *eph = filep->f_priv;
int ret;

ret = nxsem_wait(&eph->sem);
Expand All @@ -130,7 +140,7 @@ static int epoll_do_open(FAR struct file *filep)

static int epoll_do_close(FAR struct file *filep)
{
FAR struct epoll_head *eph = filep->f_inode->i_private;
FAR struct epoll_head *eph = filep->f_priv;
int ret;

ret = nxsem_wait(&eph->sem);
Expand Down Expand Up @@ -187,7 +197,7 @@ static int epoll_do_create(int size, int flags)

/* Alloc the file descriptor */

fd = files_allocate(&eph->in, flags, 0, eph, 0);
fd = files_allocate(&g_epoll_inode, flags, 0, eph, 0);
if (fd < 0)
{
nxsem_destroy(&eph->sem);
Expand All @@ -196,6 +206,7 @@ static int epoll_do_create(int size, int flags)
return -1;
}

inode_addref(&g_epoll_inode);
nxsem_post(&eph->sem);
return fd;
}
Expand Down