linux-kernel - Re: 2.6.24-rc6-mm1 - iget-stop-isofs-from-using-read

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Message-ID: <30832.1202206161@redhat.com>
Date:	Tue, 05 Feb 2008 10:09:21 +0000
From:	David Howells <dhowells@...hat.com>
To:	Valdis.Kletnieks@...edu
Cc:	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc6-mm1 - iget-stop-isofs-from-using-read_inode-fix-2.patch


How about this patch?

David
---
IGET: Fix isofs_get_block() to only return 0 on success.

From: David Howells <dhowells@...hat.com>

Fix isofs_get_block() to return only 0 on success.  It shouldn't return a +ve
block count for example.

Also make sure that isofs_get_blocks() doesn't accidentally return an error if
rv is 0 come the return statement.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/isofs/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)


diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 0f5ed8c..875d37f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1022,6 +1022,7 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 		rv++;
 	}
 
+	error = 0;
 abort:
 	unlock_kernel();
 	return rv != 0 ? rv : error;
@@ -1033,12 +1034,15 @@ abort:
 static int isofs_get_block(struct inode *inode, sector_t iblock,
 		    struct buffer_head *bh_result, int create)
 {
+	int ret;
+
 	if (create) {
 		printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
 		return -EROFS;
 	}
 
-	return isofs_get_blocks(inode, iblock, &bh_result, 1);
+	ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
+	return ret < 0 ? ret : 0;
 }
 
 static int isofs_bmap(struct inode *inode, sector_t block)
--
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