From 77e7f250f88cd62844e24c42aff4d0e95969c746 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Fri, 17 Feb 2006 13:52:52 -0800 Subject: [PATCH] [PATCH] fuse: fix bug in aborted fuse_release_end() There's a rather theoretical case of the BUG triggering in fuse_reset_request(): - iget() fails because of OOM after a successful CREATE_OPEN request - during IO on the resulting RELEASE request the connection is aborted Fix and add warning to fuse_reset_request(). Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fuse/dev.c | 6 ++++++ fs/fuse/file.c | 11 ++++++++--- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index f556a0d5c0..0c9a2ee54c 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -66,6 +66,12 @@ static void restore_sigs(sigset_t *oldset) sigprocmask(SIG_SETMASK, oldset, NULL); } +/* + * Reset request, so that it can be reused + * + * The caller must be _very_ careful to make sure, that it is holding + * the only reference to req + */ void fuse_reset_request(struct fuse_req *req) { int preallocated = req->preallocated; diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 296351615b..6f05379b0a 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -116,9 +116,14 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir) /* Special case for failed iget in CREATE */ static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) { - u64 nodeid = req->in.h.nodeid; - fuse_reset_request(req); - fuse_send_forget(fc, req, nodeid, 1); + /* If called from end_io_requests(), req has more than one + reference and fuse_reset_request() cannot work */ + if (fc->connected) { + u64 nodeid = req->in.h.nodeid; + fuse_reset_request(req); + fuse_send_forget(fc, req, nodeid, 1); + } else + fuse_put_request(fc, req); } void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff, -- 2.39.5