* [PATCH] erofs: fix double free of 'copied'
@ 2021-08-25 12:07 ` Gao Xiang
0 siblings, 0 replies; 4+ messages in thread
From: Gao Xiang @ 2021-08-25 12:07 UTC (permalink / raw)
To: linux-erofs, Chao Yu, Liu Bo
Cc: LKML, Gao Xiang, kernel test robot, Dan Carpenter
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
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] erofs: fix double free of 'copied'
@ 2021-08-25 12:07 ` Gao Xiang
0 siblings, 0 replies; 4+ messages in thread
From: Gao Xiang @ 2021-08-25 12:07 UTC (permalink / raw)
To: linux-erofs, Chao Yu, Liu Bo; +Cc: LKML, Dan Carpenter, kernel test robot
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
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] erofs: fix double free of 'copied'
2021-08-25 12:07 ` Gao Xiang
@ 2021-08-25 12:16 ` Chao Yu
-1 siblings, 0 replies; 4+ messages in thread
From: Chao Yu @ 2021-08-25 12:16 UTC (permalink / raw)
To: Gao Xiang, linux-erofs, Liu Bo; +Cc: LKML, kernel test robot, Dan Carpenter
On 2021/8/25 20:07, Gao Xiang wrote:
> 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>
Reviewed-by: Chao Yu <chao@kernel.org>
Thanks,
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] erofs: fix double free of 'copied'
@ 2021-08-25 12:16 ` Chao Yu
0 siblings, 0 replies; 4+ messages in thread
From: Chao Yu @ 2021-08-25 12:16 UTC (permalink / raw)
To: Gao Xiang, linux-erofs, Liu Bo; +Cc: LKML, Dan Carpenter, kernel test robot
On 2021/8/25 20:07, Gao Xiang wrote:
> 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>
Reviewed-by: Chao Yu <chao@kernel.org>
Thanks,
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-08-25 12:16 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2021-08-25 12:07 [PATCH] erofs: fix double free of 'copied' Gao Xiang
2021-08-25 12:07 ` Gao Xiang
2021-08-25 12:16 ` Chao Yu
2021-08-25 12:16 ` Chao Yu
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