From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
In function check_nid_range, there is no need to trigger BUG_ON and make kernel stop.
Instead it could just check and indicate the inode number to be EINVAL.
Update the return path in do_read_inode to use the return from check_nid_range.
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
---
fs/f2fs/f2fs.h | 6 ++++--
fs/f2fs/inode.c | 6 +++++-
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index be7ae70..1dae921 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -515,9 +515,11 @@ static inline void mutex_unlock_op(struct f2fs_sb_info *sbi, enum lock_type t)
/*
* Check whether the given nid is within node id range.
*/
-static inline void check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
+static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
{
- BUG_ON((nid >= NM_I(sbi)->max_nid));
+ if (nid >= NM_I(sbi)->max_nid)
+ return -EINVAL;
+ return 0;
}
#define F2FS_DEFAULT_ALLOCATED_BLOCKS 1
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index ddae412..6d82020 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -44,7 +44,11 @@ static int do_read_inode(struct inode *inode)
struct f2fs_inode *ri;
/* Check if ino is within scope */
- check_nid_range(sbi, inode->i_ino);
+ if (check_nid_range(sbi, inode->i_ino)) {
+ f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
+ (unsigned long) inode->i_ino);
+ return -EINVAL;
+ }
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page))
--
1.7.9.5
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