linux-kernel - [PATCH] Make __xfs_xattr_put_listen preperly report errors.

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Message-Id: <1471967653-2561-1-git-send-email-asavkov@redhat.com>
Date:   Tue, 23 Aug 2016 17:54:13 +0200
From:   Artem Savkov <asavkov@...hat.com>
To:     Eric Sandeen <sandeen@...deen.net>
Cc:     Dave Chinner <david@...morbit.com>, xfs@....sgi.com,
        linux-kernel@...r.kernel.org, Artem Savkov <asavkov@...hat.com>
Subject: [PATCH] Make __xfs_xattr_put_listen preperly report errors.

Commit "xfs: only return -errno or success from attr ->put_listent" changes the
returnvalue of __xfs_xattr_put_listen to 0 in case when there is insufficient
space in the buffer assuming that setting context->count to -1 would be enough,
but all of the ->put_listent callers only check seen_enough. This results in
a failed assertion:
XFS: Assertion failed: context->count >= 0, file: fs/xfs/xfs_xattr.c, line: 175
in insufficient buffer size case.

Signed-off-by: Artem Savkov <asavkov@...hat.com>
---
 fs/xfs/xfs_xattr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index ea62245..6290093 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -147,6 +147,7 @@ __xfs_xattr_put_listent(
 	arraytop = context->count + prefix_len + namelen + 1;
 	if (arraytop > context->firstu) {
 		context->count = -1;	/* insufficient space */
+		context->seen_enough = 1;
 		return 0;
 	}
 	offset = (char *)context->alist + context->count;
-- 
2.7.4