From 5dfcc87fd79dfb96ed155b524337dbd0da4f5993 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Mon, 12 Sep 2011 09:38:03 +0200 Subject: [PATCH] fuse: fix memory leak kmemleak is reporting that 32 bytes are being leaked by FUSE: unreferenced object 0xe373b270 (size 32): comm "fusermount", pid 1207, jiffies 4294707026 (age 2675.187s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] kmemleak_alloc+0x27/0x50 [] kmem_cache_alloc+0xc5/0x180 [] fuse_alloc_forget+0x1e/0x20 [] fuse_alloc_inode+0xb0/0xd0 [] alloc_inode+0x1c/0x80 [] iget5_locked+0x8f/0x1a0 [] fuse_iget+0x72/0x1a0 [] fuse_get_root_inode+0x8a/0x90 [] fuse_fill_super+0x3ef/0x590 [] mount_nodev+0x3f/0x90 [] fuse_mount+0x15/0x20 [] mount_fs+0x1c/0xc0 [] vfs_kern_mount+0x41/0x90 [] do_kern_mount+0x39/0xd0 [] do_mount+0x2e5/0x660 [] sys_mount+0x66/0xa0 This leak report is consistent and happens once per boot on 3.1.0-rc5-dirty. This happens if a FORGET request is queued after the fuse device was released. Reported-by: Sitsofe Wheeler Signed-off-by: Miklos Szeredi Tested-by: Sitsofe Wheeler Signed-off-by: Linus Torvalds --- fs/fuse/dev.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 168a80f7f12b..5cb8614508c3 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -258,10 +258,14 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, forget->forget_one.nlookup = nlookup; spin_lock(&fc->lock); - fc->forget_list_tail->next = forget; - fc->forget_list_tail = forget; - wake_up(&fc->waitq); - kill_fasync(&fc->fasync, SIGIO, POLL_IN); + if (fc->connected) { + fc->forget_list_tail->next = forget; + fc->forget_list_tail = forget; + wake_up(&fc->waitq); + kill_fasync(&fc->fasync, SIGIO, POLL_IN); + } else { + kfree(forget); + } spin_unlock(&fc->lock); } -- 2.20.1