linux-kernel - [PATCH 3.4 066/176] isofs: Fix infinite looping over CE entries

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Message-Id: <1428569224-23820-66-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:14 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 066/176] isofs: Fix infinite looping over CE entries

From: Jan Kara <jack@...e.cz>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit f54e18f1b831c92f6512d2eedb224cd63d607d3d upstream.

Rock Ridge extensions define so called Continuation Entries (CE) which
define where is further space with Rock Ridge data. Corrupted isofs
image can contain arbitrarily long chain of these, including a one
containing loop and thus causing kernel to end in an infinite loop when
traversing these entries.

Limit the traversal to 32 entries which should be more than enough space
to store all the Rock Ridge data.

Reported-by: P J P <ppandit@...hat.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/isofs/rock.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index ee62cc0..26859de 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -30,6 +30,7 @@ struct rock_state {
 	int cont_size;
 	int cont_extent;
 	int cont_offset;
+	int cont_loops;
 	struct inode *inode;
 };
 
@@ -73,6 +74,9 @@ static void init_rock_state(struct rock_state *rs, struct inode *inode)
 	rs->inode = inode;
 }
 
+/* Maximum number of Rock Ridge continuation entries */
+#define RR_MAX_CE_ENTRIES 32
+
 /*
  * Returns 0 if the caller should continue scanning, 1 if the scan must end
  * and -ve on error.
@@ -105,6 +109,8 @@ static int rock_continue(struct rock_state *rs)
 			goto out;
 		}
 		ret = -EIO;
+		if (++rs->cont_loops >= RR_MAX_CE_ENTRIES)
+			goto out;
 		bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
 		if (bh) {
 			memcpy(rs->buffer, bh->b_data + rs->cont_offset,
-- 
1.9.1

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