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authorPrem Karat <prem.karat@linux.vnet.ibm.com>2011-05-06 18:24:18 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2011-07-23 09:32:48 -0500
commita2dd43bb0d7b9ce28f8a39254c25840c0730498e (patch)
tree83b487379263d273549aefd0528edf24b602e47e /fs/9p
parentfd2421f54423f307ecd31bdebdca6bc317e0c492 (diff)
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fs/9p: Fix invalid mount options/args
Without this fix, if any invalid mount options/args are passed while mouting the 9p fs, no error (-EINVAL) is returned and default arg value is assigned. This fix returns -EINVAL when an invalid arguement is found while parsing mount options. Signed-off-by: Prem Karat <prem.karat@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/v9fs.c43
1 files changed, 34 insertions, 9 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 8b7c6be2450..ef966188611 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -78,6 +78,25 @@ static const match_table_t tokens = {
{Opt_err, NULL}
};
+/* Interpret mount options for cache mode */
+static int get_cache_mode(char *s)
+{
+ int version = -EINVAL;
+
+ if (!strcmp(s, "loose")) {
+ version = CACHE_LOOSE;
+ P9_DPRINTK(P9_DEBUG_9P, "Cache mode: loose\n");
+ } else if (!strcmp(s, "fscache")) {
+ version = CACHE_FSCACHE;
+ P9_DPRINTK(P9_DEBUG_9P, "Cache mode: fscache\n");
+ } else if (!strcmp(s, "none")) {
+ version = CACHE_NONE;
+ P9_DPRINTK(P9_DEBUG_9P, "Cache mode: none\n");
+ } else
+ printk(KERN_INFO "9p: Unknown Cache mode %s.\n", s);
+ return version;
+}
+
/**
* v9fs_parse_options - parse mount options into session structure
* @v9ses: existing v9fs session information
@@ -97,7 +116,7 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
/* setup defaults */
v9ses->afid = ~0;
v9ses->debug = 0;
- v9ses->cache = 0;
+ v9ses->cache = CACHE_NONE;
#ifdef CONFIG_9P_FSCACHE
v9ses->cachetag = NULL;
#endif
@@ -171,13 +190,13 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
"problem allocating copy of cache arg\n");
goto free_and_return;
}
+ ret = get_cache_mode(s);
+ if (ret == -EINVAL) {
+ kfree(s);
+ goto free_and_return;
+ }
- if (strcmp(s, "loose") == 0)
- v9ses->cache = CACHE_LOOSE;
- else if (strcmp(s, "fscache") == 0)
- v9ses->cache = CACHE_FSCACHE;
- else
- v9ses->cache = CACHE_NONE;
+ v9ses->cache = ret;
kfree(s);
break;
@@ -200,9 +219,15 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
} else {
v9ses->flags |= V9FS_ACCESS_SINGLE;
v9ses->uid = simple_strtoul(s, &e, 10);
- if (*e != '\0')
- v9ses->uid = ~0;
+ if (*e != '\0') {
+ ret = -EINVAL;
+ printk(KERN_INFO "9p: Unknown access "
+ "argument %s.\n", s);
+ kfree(s);
+ goto free_and_return;
+ }
}
+
kfree(s);
break;