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| author | Dominique Martinet <dominique.martinet@cea.fr> | 2018-08-27 15:12:05 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-01 09:46:33 +0100 |
| commit | ebd55db37fa7856ddc182da5587dd2189940d987 (patch) | |
| tree | c7cc5438b857b9a2595eb1bd269fb3fdc6d8d80e /fs | |
| parent | 79faf409b184b586f05f0b5cdee60953f5541d0b (diff) | |
| download | linux-stable-ebd55db37fa7856ddc182da5587dd2189940d987.tar.gz linux-stable-ebd55db37fa7856ddc182da5587dd2189940d987.tar.bz2 linux-stable-ebd55db37fa7856ddc182da5587dd2189940d987.zip | |
v9fs_dir_readdir: fix double-free on p9stat_read error
commit 81c99089bce693b94b775b6eb888115d2d540086 upstream.
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.
Link: http://lkml.kernel.org/r/1535410108-20650-1-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reported-by: syzbot+d4252148d198410b864f@syzkaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/9p/vfs_dir.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c index 5cc00e56206e..7d889f56b8e7 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; |