9p: check memory allocation result for cachetag

Check memory allocation result for cachetag in mount option parsing and
fix potential memory leak in the error case.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Chengguang Xu <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Eric Van Hensbergen <[email protected]>
Cc: Ron Minnich <[email protected]>
Cc: Latchesar Ionkov <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chengguang Xu 2018-04-05 16:19:53 -07:00 • committed by Linus Torvalds
commit a25c36577c

View file

@ -292,6 +292,10 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
#ifdef CONFIG_9P_FSCACHE
kfree(v9ses->cachetag);
v9ses->cachetag = match_strdup(&args[0]);
if (!v9ses->cachetag) {
ret = -ENOMEM;
goto free_and_return;
}
#endif
break;
case Opt_cache:
@ -471,6 +475,9 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
return fid;
err_clnt:
#ifdef CONFIG_9P_FSCACHE
kfree(v9ses->cachetag);
#endif
p9_client_destroy(v9ses->clnt);
err_names:
kfree(v9ses->uname);