Messages in this thread Patch in this message |  | | From | Dominique Martinet <> | Subject | [PATCH 1/2] v9fs_dir_readdir: fix double-free on p9stat_read error | Date | Tue, 28 Aug 2018 00:48:27 +0200 |
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From: Dominique Martinet <dominique.martinet@cea.fr>
p9stat_read will call p9stat_free on error, we should only free the struct content on success.
There also is no need to "p9stat_init" st as the read function will zero the whole struct for us anyway, so clean up the code a bit while we are here.
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Reported-by: syzbot+d4252148d198410b864f@syzkaller.appspotmail.com Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> --- fs/9p/vfs_dir.c | 11 ----------- 1 file changed, 11 deletions(-)
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c index b0405d6aac85..48db9a9f13f9 100644 --- a/fs/9p/vfs_dir.c +++ b/fs/9p/vfs_dir.c @@ -76,15 +76,6 @@ static inline int dt_type(struct p9_wstat *mistat) return rettype; } -static void p9stat_init(struct p9_wstat *stbuf) -{ - stbuf->name = NULL; - stbuf->uid = NULL; - stbuf->gid = NULL; - stbuf->muid = NULL; - stbuf->extension = NULL; -} - /** * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir * @filp: opened file structure @@ -145,12 +136,10 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx) rdir->tail = n; } while (rdir->head < rdir->tail) { - p9stat_init(&st); err = p9stat_read(fid->clnt, rdir->buf + rdir->head, rdir->tail - rdir->head, &st); if (err) { p9_debug(P9_DEBUG_VFS, "returned %d\n", err); - p9stat_free(&st); return -EIO; } reclen = st.size+2; -- 2.17.1
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