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Date: Wed, 2 May 2018 04:05:39 +0100 (BST) From: James Simmons <jsimmons@...radead.org> To: NeilBrown <neilb@...e.com> cc: Oleg Drokin <oleg.drokin@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andreas Dilger <andreas.dilger@...el.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Lustre Development List <lustre-devel@...ts.lustre.org> Subject: Re: [PATCH 10/10] staging: lustre: fix error deref in ll_splice_alias(). > d_splice_alias() can return an ERR_PTR(). > If it does while debugging is enabled, the following > CDEBUG() will dereference that error and crash. > > So add appropriate checking, and provide a separate > debug message for the error case. Yeah!!! It fixed the issues. Thank you. Reviewed-by: James Simmons <jsimmons@...radead.org> > Reported-by: James Simmons <jsimmons@...radead.org> > Fixes: e9d4f0b9f559 ("staging: lustre: llite: use d_splice_alias for directories.") > Signed-off-by: NeilBrown <neilb@...e.com> > --- > drivers/staging/lustre/lustre/llite/namei.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c > index 6c9ec462eb41..24a6873d86a2 100644 > --- a/drivers/staging/lustre/lustre/llite/namei.c > +++ b/drivers/staging/lustre/lustre/llite/namei.c > @@ -442,11 +442,15 @@ struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de) > } else { > struct dentry *new = d_splice_alias(inode, de); > > + if (IS_ERR(new)) > + CDEBUG(D_DENTRY, "splice inode %p as %pd gives error %lu\n", > + inode, de, PTR_ERR(new)); > if (new) > de = new; > } > - CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n", > - de, d_inode(de), d_count(de), de->d_flags); > + if (!IS_ERR(de)) > + CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n", > + de, d_inode(de), d_count(de), de->d_flags); > return de; > } > > > >
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