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net/9p/client.c: fix potential refcnt problem of trans module 

When specifying trans_mod multiple times in a mount, it will cause an
inaccurate refcount of the trans module.  Also, in the error case of
option parsing, we should put the trans module if we have already got
it.

Link: http://lkml.kernel.org/r/1522154942-57339-1-git-send-email-cgxu519@gmx.com
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chengguang Xu 2018-04-05 16:20:01 -07:00 committed by Linus Torvalds
parent 7ff3c20468
commit 9421c3e641
1 changed files with 4 additions and 1 deletions
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5
net/9p/client.c
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@ -190,7 +190,9 @@ static int parse_opts(char *opts, struct p9_client *clnt)
p9_debug(P9_DEBUG_ERROR,
"problem allocating copy of trans arg\n");
goto free_and_return;
}
}
v9fs_put_trans(clnt->trans_mod);
clnt->trans_mod = v9fs_get_trans_by_name(s);
if (clnt->trans_mod == NULL) {
pr_info("Could not find request transport: %s\n",
@ -226,6 +228,7 @@ static int parse_opts(char *opts, struct p9_client *clnt)
}
free_and_return:
v9fs_put_trans(clnt->trans_mod);
kfree(tmp_options);
return ret;
}