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9p: Fix memory leak in v9fs_mount

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commit cb0aae0e31c632c407a2cab4307be85a001d4d98 upstream.

v9fs_mount
  v9fs_session_init
    v9fs_cache_session_get_cookie
      v9fs_random_cachetag                     -->alloc cachetag
      v9ses->fscache = fscache_acquire_cookie  -->maybe NULL
  sb = sget                                    -->fail, goto clunk
clunk_fid:
  v9fs_session_close
    if (v9ses->fscache)                        -->NULL
      kfree(v9ses->cachetag)

Thus memleak happens.

Link: http://lkml.kernel.org/r/20200615012153.89538-1-zhengbin13@huawei.com
Fixes: 60e78d2c99 ("9p: Add fscache support to 9p")
Cc: <stable@vger.kernel.org> # v2.6.32+
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zheng Bin 2020-06-15 09:21:53 +08:00 committed by Greg Kroah-Hartman
parent 10de419977
commit 06d8ba5149
1 changed files with 2 additions and 3 deletions
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5
fs/9p/v9fs.c
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@ -500,10 +500,9 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
}
#ifdef CONFIG_9P_FSCACHE
if (v9ses->fscache) {
if (v9ses->fscache)
v9fs_cache_session_put_cookie(v9ses);
kfree(v9ses->cachetag);
}
kfree(v9ses->cachetag);
#endif
kfree(v9ses->uname);
kfree(v9ses->aname);