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authorChengguang Xu <cgxu519@gmx.com>2018-04-05 16:20:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 21:36:23 -0700
commit9421c3e64137ec69e5cf4ed024dc777a09b7779f (patch)
tree53dfc3a13cfc070472ae9a0aa4d6dadd9fc1cf30 /net/9p/client.c
parent7ff3c2046803ac99d95de6d63cda46c84f72293b (diff)
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>
Diffstat (limited to 'net/9p/client.c')
-rw-r--r--net/9p/client.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index e6cae8332e2e..21e6df1cc70f 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -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;
}