| From 4304297cb2522def7cd00ed21508896724db871d Mon Sep 17 00:00:00 2001 |
| From: Yunfeng Ye <yeyunfeng@huawei.com> |
| Date: Thu, 30 Jan 2020 22:17:26 -0800 |
| Subject: [PATCH] reiserfs: prevent NULL pointer dereference in |
| reiserfs_insert_item() |
| |
| commit aacee5446a2a1aa35d0a49dab289552578657fb4 upstream. |
| |
| The variable inode may be NULL in reiserfs_insert_item(), but there is |
| no check before accessing the member of inode. |
| |
| Fix this by adding NULL pointer check before calling reiserfs_debug(). |
| |
| Link: http://lkml.kernel.org/r/79c5135d-ff25-1cc9-4e99-9f572b88cc00@huawei.com |
| Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com> |
| Cc: zhengbin <zhengbin13@huawei.com> |
| Cc: Hu Shiyuan <hushiyuan@huawei.com> |
| Cc: Feilong Lin <linfeilong@huawei.com> |
| Cc: Jan Kara <jack@suse.cz> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c |
| index 0037aea97d39..2946713cb00d 100644 |
| --- a/fs/reiserfs/stree.c |
| +++ b/fs/reiserfs/stree.c |
| @@ -2250,7 +2250,8 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, |
| /* also releases the path */ |
| unfix_nodes(&s_ins_balance); |
| #ifdef REISERQUOTA_DEBUG |
| - reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
| + if (inode) |
| + reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
| "reiserquota insert_item(): freeing %u id=%u type=%c", |
| quota_bytes, inode->i_uid, head2type(ih)); |
| #endif |
| -- |
| 2.7.4 |
| |
