* fs/9p/v9fs.c (v9fs_parse_options): Handle kstrdup and match_strdup failure.
Now that this function can fail, return an int, diagnose other option-parsing
failures, and adjust the sole caller:
(v9fs_session_init): Handle kstrdup failure. Propagate any new
v9fs_parse_options failure "up".
Signed-off-by: Jim Meyering <[EMAIL PROTECTED]>
---
FYI, my first crack at cleaning up v9fs_parse_options
removed the match_strdup call altogether, but was more
invasive in that it added a new function, match_strcmp and
made the existing match_number function public.
The patch below just handles the match_strdup failure.
fs/9p/v9fs.c | 40 ++++++++++++++++++++++++++++++++++------
1 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 9b0f022..8ca142c 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -74,16 +74,17 @@ static match_table_t tokens = {
* @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 +92,26 @@ 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;
}
}
@@ -139,6 +147,13 @@ 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 +173,7 @@ static void v9fs_parse_options(struct v9fs_session_info
*v9ses)
}
}
kfree(options);
+ return ret;
}
/**
@@ -173,6 +189,7 @@ 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)
@@ -191,7 +208,18 @@ 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);
--
1.5.4.2.134.g82883
--
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