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SubjectRe: [PATCH 3/3] fs: ocfs2: Fix a possible null-pointer dereference in ocfs2_info_scan_inode_alloc()
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On 19/7/26 11:37, Jia-Ju Bai wrote:
> In ocfs2_info_scan_inode_alloc(), there is an if statement on line 283
> to check whether inode_alloc is NULL:
> if (inode_alloc)
>
> When inode_alloc is NULL, it is used on line 287:
> ocfs2_inode_lock(inode_alloc, &bh, 0);
> ocfs2_inode_lock_full_nested(inode, ...)
> struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
>
> Thus, a possible null-pointer dereference may occur.
>
> To fix this bug, inode_alloc is checked on line 286.
>
> This bug is found by a static analysis tool STCheck written by us.
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>

Looks good.
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
> ---
> fs/ocfs2/ioctl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
> index d6f7b299eb23..efeea208fdeb 100644
> --- a/fs/ocfs2/ioctl.c
> +++ b/fs/ocfs2/ioctl.c
> @@ -283,7 +283,7 @@ static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
> if (inode_alloc)
> inode_lock(inode_alloc);
>
> - if (o2info_coherent(&fi->ifi_req)) {
> + if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
> status = ocfs2_inode_lock(inode_alloc, &bh, 0);
> if (status < 0) {
> mlog_errno(status);
>

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