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erofs: fix double free of 'copied'

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Dan reported a new smatch warning [1]
"fs/erofs/inode.c:210 erofs_read_inode() error: double free of 'copied'"

Due to new chunk-based format handling logic, the error path can be
called after kfree(copied).

Set "copied = NULL" after kfree(copied) to fix this.

[1] https://lore.kernel.org/r/202108251030.bELQozR7-lkp@intel.com

Link: https://lore.kernel.org/r/20210825120757.11034-1-hsiangkao@linux.alibaba.com
Fixes: c5aa903a59 ("erofs: support reading chunk-based uncompressed files")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2021-08-25 20:07:57 +08:00
parent c5aa903a59
commit 1266b4a7ec
1 changed files with 1 additions and 0 deletions
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1
fs/erofs/inode.c
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@ -127,6 +127,7 @@ static struct page *erofs_read_inode(struct inode *inode,
/* fill chunked inode summary info */
vi->chunkformat = le16_to_cpu(die->i_u.c.format);
kfree(copied);
copied = NULL;
break;
case EROFS_INODE_LAYOUT_COMPACT:
vi->inode_isize = sizeof(struct erofs_inode_compact);