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| author | Amir Goldstein <amir73il@gmail.com> | 2023-05-24 18:48:25 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2023-05-25 14:17:04 +0300 |
| commit | 7cdafe6cc4a6ee94c56a5c96d6edd80d066d5a3b (patch) | |
| tree | f1e0b02718ede6480fc58517d9a8e38f8edc71a7 /fs/notify | |
| parent | a95aef69a740f5a1c7d70f2b58552207edaef99a (diff) | |
| download | linux-7cdafe6cc4a6ee94c56a5c96d6edd80d066d5a3b.tar.xz | |
exportfs: check for error return value from exportfs_encode_*()
The exportfs_encode_*() helpers call the filesystem ->encode_fh()
method which returns a signed int.
All the in-tree implementations of ->encode_fh() return a positive
integer and FILEID_INVALID (255) for error.
Fortify the callers for possible future ->encode_fh() implementation
that will return a negative error value.
name_to_handle_at() would propagate the returned error to the users
if filesystem ->encode_fh() method returns an error.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/linux-fsdevel/ca02955f-1877-4fde-b453-3c1d22794740@kili.mountain/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230524154825.881414-1-amir73il@gmail.com>
Diffstat (limited to 'fs/notify')
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index d2bbf1445a9e..9dac7f6e72d2 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -445,7 +445,7 @@ static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode, dwords = fh_len >> 2; type = exportfs_encode_fid(inode, buf, &dwords); err = -EINVAL; - if (!type || type == FILEID_INVALID || fh_len != dwords << 2) + if (type <= 0 || type == FILEID_INVALID || fh_len != dwords << 2) goto out_err; fh->type = type; |