Messages in this thread Patch in this message | | | From | Gao Xiang <> | Subject | [PATCH] erofs: fix double free of 'copied' | Date | Wed, 25 Aug 2021 20:07:57 +0800 |
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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 Fixes: c5aa903a59db ("erofs: support reading chunk-based uncompressed files") Reported-by: kernel test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> --- fs/erofs/inode.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 4408929bd6f5..31ac3a73b390 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -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); -- 2.24.4
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