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fix a leak in fcntl_dirnotify()

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[into #fixes, unless somebody objects]

Lifetime of new_dn_mark is controlled by that of its ->fsn_mark,
pointed to by new_fsn_mark.  Unfortunately, a failure exit had
been inserted between the allocation of new_dn_mark and the
call of fsnotify_init_mark(), ending up with a leak.

Fixes: 1934b21261 "file: reclaim 24 bytes from f_owner"
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/20250712171843.GB1880847@ZenIV
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Al Viro 2025-07-12 18:18:43 +01:00 committed by Christian Brauner
parent 177bb4cba9
commit fdfe013347
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 4 additions and 4 deletions
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8
fs/notify/dnotify/dnotify.c
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@ -308,6 +308,10 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
goto out_err;
}
error = file_f_owner_allocate(filp);
if (error)
goto out_err;
/* new fsnotify mark, we expect most fcntl calls to add a new mark */
new_dn_mark = kmem_cache_alloc(dnotify_mark_cache, GFP_KERNEL);
if (!new_dn_mark) {
@ -315,10 +319,6 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
goto out_err;
}
error = file_f_owner_allocate(filp);
if (error)
goto out_err;
/* set up the new_fsn_mark and new_dn_mark */
new_fsn_mark = &new_dn_mark->fsn_mark;
fsnotify_init_mark(new_fsn_mark, dnotify_group);