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fanotify: Encode empty file handle when no inode is provided

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Instead of failing, encode an invalid file handle in fanotify_encode_fh
if no inode is provided.  This bogus file handle will be reported by
FAN_FS_ERROR for non-inode errors.

Link: https://lore.kernel.org/r/20211025192746.66445-16-krisman@collabora.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Gabriel Krisman Bertazi 2021-10-25 16:27:30 -03:00 committed by Jan Kara
parent 74fe473489
commit 272531ac61
1 changed files with 8 additions and 1 deletions
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9
fs/notify/fanotify/fanotify.c
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@ -370,8 +370,14 @@ static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
fh->type = FILEID_ROOT;
fh->len = 0;
fh->flags = 0;
/*
* Invalid FHs are used by FAN_FS_ERROR for errors not
* linked to any inode. The f_handle won't be reported
* back to userspace.
*/
if (!inode)
return 0;
goto out;
/*
* !gpf means preallocated variable size fh, but fh_len could
@ -403,6 +409,7 @@ static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
fh->type = type;
fh->len = fh_len;
out:
/*
* Mix fh into event merge key. Hash might be NULL in case of
* unhashed FID events (i.e. FAN_FS_ERROR).