4.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: piaojun <piaojun@xxxxxxxxxx>
[ Upstream commit c290fba8c4ce6530cd941ea14db5a4ac2f77183f ]
In my testing, the second mount will fail after umounting successfully.
The reason is that we put refcount of trans_mod in the correct case
rather than the error case in parse_opts() at last. That will cause the
refcount decrease to -1, and when we try to get trans_mod again in
try_module_get(), we could only increase refcount to 0 which will cause
failure as follows:
parse_opts
v9fs_get_trans_by_name
try_module_get : return NULL to caller which cause error
So we should put refcount of trans_mod in error case.
Link: http://lkml.kernel.org/r/5B3F39A0.2030509@xxxxxxxxxx
Fixes: 9421c3e64137ec ("net/9p/client.c: fix potential refcnt problem of trans module")
Signed-off-by: Jun Piao <piaojun@xxxxxxxxxx>
Reviewed-by: Yiwen Jiang <jiangyiwen@xxxxxxxxxx>
Reviewed-by: Greg Kurz <groug@xxxxxxxx>
Reviewed-by: Dominique Martinet <dominique.martinet@xxxxxx>
Tested-by: Dominique Martinet <dominique.martinet@xxxxxx>
Cc: Eric Van Hensbergen <ericvh@xxxxxxxxx>
Cc: Ron Minnich <rminnich@xxxxxxxxxx>
Cc: Latchesar Ionkov <lucho@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/9p/client.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -228,7 +228,8 @@ static int parse_opts(char *opts, struct
}
free_and_return:
- v9fs_put_trans(clnt->trans_mod);
+ if (ret)
+ v9fs_put_trans(clnt->trans_mod);
kfree(tmp_options);
return ret;
}
