fs/9p/v9fs.c (v9fs_parse_options): Handle kstrdup and match_strdup failure. Now that...

Signed-off-by: Jim Meyering <meyering@redhat.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 79d310c..5c1ccaf 100644 (file)
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -73,16 +73,17 @@ static match_table_t tokens = {
  * v9fs_parse_options - parse mount options into session structure
  * @v9ses: existing v9fs session information
  *
+ * Return 0 upon success, -ERRNO upon failure.
  */
 
-static void v9fs_parse_options(struct v9fs_session_info *v9ses)
+static int v9fs_parse_options(struct v9fs_session_info *v9ses)
 {
        char *options;
        substring_t args[MAX_OPT_ARGS];
        char *p;
        int option = 0;
        char *s, *e;
-       int ret;
+       int ret = 0;
 
        /* setup defaults */
        v9ses->afid = ~0;
@@ -90,19 +91,26 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
        v9ses->cache = 0;
 
        if (!v9ses->options)
-               return;
+               return 0;
 
        options = kstrdup(v9ses->options, GFP_KERNEL);
+       if (!options) {
+               P9_DPRINTK(P9_DEBUG_ERROR,
+                          "failed to allocate copy of option string\n");
+               return -ENOMEM;
+       }
+
        while ((p = strsep(&options, ",")) != NULL) {
                int token;
                if (!*p)
                        continue;
                token = match_token(p, tokens, args);
                if (token < Opt_uname) {
-                       ret = match_int(&args[0], &option);
-                       if (ret < 0) {
+                       int r = match_int(&args[0], &option);
+                       if (r < 0) {
                                P9_DPRINTK(P9_DEBUG_ERROR,
                                        "integer field, but no integer?\n");
+                               ret = r;
                                continue;
                        }
                }
@@ -138,6 +146,13 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 
                case Opt_access:
                        s = match_strdup(&args[0]);
+                       if (!s) {
+                               P9_DPRINTK(P9_DEBUG_ERROR,
+                                          "failed to allocate copy"
+                                          " of option argument\n");
+                               ret = -ENOMEM;
+                               break;
+                       }
                        v9ses->flags &= ~V9FS_ACCESS_MASK;
                        if (strcmp(s, "user") == 0)
                                v9ses->flags |= V9FS_ACCESS_USER;
@@ -157,6 +172,7 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
                }
        }
        kfree(options);
+       return ret;
 }
 
 /**
@@ -172,6 +188,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 {
        int retval = -EINVAL;
        struct p9_fid *fid;
+       int rc;
 
        v9ses->uname = __getname();
        if (!v9ses->uname)
@@ -190,7 +207,18 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
        v9ses->dfltuid = V9FS_DEFUID;
        v9ses->dfltgid = V9FS_DEFGID;
        v9ses->options = kstrdup(data, GFP_KERNEL);
-       v9fs_parse_options(v9ses);
+       if (!v9ses->options) {
+               P9_DPRINTK(P9_DEBUG_ERROR,
+                          "failed to allocate copy of option string\n");
+               retval = -ENOMEM;
+               goto error;
+       }
+
+       rc = v9fs_parse_options(v9ses);
+       if (rc < 0) {
+               retval = rc;
+               goto error;
+       }
 
        v9ses->clnt = p9_client_create(dev_name, v9ses->options);