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Fix NULL as mount(2) syscall data parameter

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Passing NULL for the mount data should not result in EINVAL.  It
should be treated as if an empty string were passed and succeed.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Closes #3771
This commit is contained in:
Brian Behlendorf 2015-09-19 12:32:38 -07:00
parent f52ebcb3eb
commit 66aad10ce8
1 changed files with 22 additions and 21 deletions
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43
module/zfs/zpl_super.c
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@ -227,8 +227,7 @@ static const match_table_t zpl_tokens = {
};
static int
zpl_parse_option(char *option, int token, substring_t *args,
zfs_mntopts_t *zmo, boolean_t isremount)
zpl_parse_option(char *option, int token, substring_t *args, zfs_mntopts_t *zmo)
{
switch (token) {
case TOKEN_RO:
@ -318,32 +317,34 @@ zpl_parse_options(char *osname, char *mntopts, zfs_mntopts_t *zmo,
boolean_t isremount)
{
zfs_mntopts_t *tmp_zmo;
substring_t args[MAX_OPT_ARGS];
char *tmp_mntopts, *p;
int error, token;
if (mntopts == NULL)
return (-EINVAL);
int error;
tmp_zmo = zfs_mntopts_alloc();
tmp_zmo->z_osname = strdup(osname);
tmp_mntopts = strdup(mntopts);
while ((p = strsep(&tmp_mntopts, ",")) != NULL) {
if (!*p)
continue;
if (mntopts) {
substring_t args[MAX_OPT_ARGS];
char *tmp_mntopts, *p;
int token;
args[0].to = args[0].from = NULL;
token = match_token(p, zpl_tokens, args);
error = zpl_parse_option(p, token, args, tmp_zmo, isremount);
if (error) {
zfs_mntopts_free(tmp_zmo);
strfree(tmp_mntopts);
return (error);
tmp_mntopts = strdup(mntopts);
while ((p = strsep(&tmp_mntopts, ",")) != NULL) {
if (!*p)
continue;
args[0].to = args[0].from = NULL;
token = match_token(p, zpl_tokens, args);
error = zpl_parse_option(p, token, args, tmp_zmo);
if (error) {
zfs_mntopts_free(tmp_zmo);
strfree(tmp_mntopts);
return (error);
}
}
}
strfree(tmp_mntopts);
strfree(tmp_mntopts);
}
if (isremount == B_TRUE) {
if (zmo->z_osname)