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| author | Miklos Szeredi <miklos@szeredi.hu> | 2006-02-17 13:52:52 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-17 13:59:27 -0800 |
| commit | 77e7f250f88cd62844e24c42aff4d0e95969c746 (patch) | |
| tree | ee14c76d87f8ac141d2fee43e40278b5fcadadd8 /fs | |
| parent | a8534adb74e23374889b84b3d97eb18da542a1b5 (diff) | |
| download | lwn-77e7f250f88cd62844e24c42aff4d0e95969c746.tar.gz lwn-77e7f250f88cd62844e24c42aff4d0e95969c746.zip | |
[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 <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fuse/dev.c | 6 | ||||
| -rw-r--r-- | 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 f556a0d5c0d3..0c9a2ee54c91 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 296351615b00..6f05379b0a0d 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, |