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Diffstat (limited to 'fs/9p/v9fs.c')
-rw-r--r--fs/9p/v9fs.c57
1 files changed, 44 insertions, 13 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 9b0f0222e8b..047c791427a 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -71,19 +71,19 @@ static match_table_t tokens = {
/**
* v9fs_parse_options - parse mount options into session structure
- * @options: options string passed from mount
* @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;
@@ -91,19 +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;
}
}
@@ -125,10 +132,10 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
v9ses->afid = option;
break;
case Opt_uname:
- match_strcpy(v9ses->uname, &args[0]);
+ match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
break;
case Opt_remotename:
- match_strcpy(v9ses->aname, &args[0]);
+ match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
break;
case Opt_nodevmap:
v9ses->nodev = 1;
@@ -139,6 +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;
@@ -158,6 +172,7 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
}
}
kfree(options);
+ return ret;
}
/**
@@ -173,6 +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)
@@ -190,8 +206,21 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
v9ses->uid = ~0;
v9ses->dfltuid = V9FS_DEFUID;
v9ses->dfltgid = V9FS_DEFGID;
- v9ses->options = kstrdup(data, GFP_KERNEL);
- v9fs_parse_options(v9ses);
+ if (data) {
+ v9ses->options = kstrdup(data, GFP_KERNEL);
+ 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);
@@ -233,7 +262,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
return fid;
error:
- v9fs_session_close(v9ses);
return ERR_PTR(retval);
}
@@ -256,9 +284,12 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
}
/**
- * v9fs_session_cancel - mark transport as disconnected
- * and cancel all pending requests.
+ * v9fs_session_cancel - terminate a session
+ * @v9ses: session to terminate
+ *
+ * mark transport as disconnected and cancel all pending requests.
*/
+
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
p9_client_disconnect(v9ses->clnt);