Btrfs: add sanity checks regarding to parsing mount options
I just notice the following commands succeed:
mount <dev> <mnt> -o thread_pool=-1
This is ridiculous, only positive thread_pool makes sense,this
patch adds sanity checks for them, and also catches the error of
ENOMEM if allocating memory fails.
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 8eb6191..cc00295 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -496,10 +496,15 @@
btrfs_set_opt(info->mount_opt, NOBARRIER);
break;
case Opt_thread_pool:
- intarg = 0;
- match_int(&args[0], &intarg);
- if (intarg)
+ ret = match_int(&args[0], &intarg);
+ if (ret) {
+ goto out;
+ } else if (intarg > 0) {
info->thread_pool_size = intarg;
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
break;
case Opt_max_inline:
num = match_strdup(&args[0]);
@@ -514,6 +519,9 @@
}
printk(KERN_INFO "btrfs: max_inline at %llu\n",
(unsigned long long)info->max_inline);
+ } else {
+ ret = -ENOMEM;
+ goto out;
}
break;
case Opt_alloc_start:
@@ -526,6 +534,9 @@
printk(KERN_INFO
"btrfs: allocations start at %llu\n",
(unsigned long long)info->alloc_start);
+ } else {
+ ret = -ENOMEM;
+ goto out;
}
break;
case Opt_noacl:
@@ -540,12 +551,16 @@
btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
break;
case Opt_ratio:
- intarg = 0;
- match_int(&args[0], &intarg);
- if (intarg) {
+ ret = match_int(&args[0], &intarg);
+ if (ret) {
+ goto out;
+ } else if (intarg >= 0) {
info->metadata_ratio = intarg;
printk(KERN_INFO "btrfs: metadata ratio %d\n",
info->metadata_ratio);
+ } else {
+ ret = -EINVAL;
+ goto out;
}
break;
case Opt_discard:
@@ -596,13 +611,17 @@
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
break;
case Opt_check_integrity_print_mask:
- intarg = 0;
- match_int(&args[0], &intarg);
- if (intarg) {
+ ret = match_int(&args[0], &intarg);
+ if (ret) {
+ goto out;
+ } else if (intarg >= 0) {
info->check_integrity_print_mask = intarg;
printk(KERN_INFO "btrfs:"
" check_integrity_print_mask 0x%x\n",
info->check_integrity_print_mask);
+ } else {
+ ret = -EINVAL;
+ goto out;
}
break;
#else
@@ -679,17 +698,25 @@
case Opt_subvol:
kfree(*subvol_name);
*subvol_name = match_strdup(&args[0]);
+ if (!*subvol_name) {
+ error = -ENOMEM;
+ goto out;
+ }
break;
case Opt_subvolid:
- intarg = 0;
error = match_int(&args[0], &intarg);
if (!error) {
+ goto out;
+ } else if (intarg >= 0) {
/* we want the original fs_tree */
if (!intarg)
*subvol_objectid =
BTRFS_FS_TREE_OBJECTID;
else
*subvol_objectid = intarg;
+ } else {
+ error = -EINVAL;
+ goto out;
}
break;
case Opt_subvolrootid: