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authorDave Chinner <david@fromorbit.com>2008-11-17 09:37:10 +0300
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-11-17 09:37:10 +0300
commitcc09c0dc57de7f7d2ed89d480b5653e5f6a32f2c (patch)
tree3c6145ccb00f603c47e020cfa45f159ab76cf9bf /fs/xfs/xfs_log_priv.h
parent6307091fe69ae74747298bdcaf43119ad67bda3a (diff)
downloadlinux-cc09c0dc57de7f7d2ed89d480b5653e5f6a32f2c.tar.xz
[XFS] Fix double free of log tickets
When an I/O error occurs during an intermediate commit on a rolling transaction, xfs_trans_commit() will free the transaction structure and the related ticket. However, the duplicate transaction that gets used as the transaction continues still contains a pointer to the ticket. Hence when the duplicate transaction is cancelled and freed, we free the ticket a second time. Add reference counting to the ticket so that we hold an extra reference to the ticket over the transaction commit. We drop the extra reference once we have checked that the transaction commit did not return an error, thus avoiding a double free on commit error. Credit to Nick Piggin for tripping over the problem. SGI-PV: 989741 Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log_priv.h')
-rw-r--r--fs/xfs/xfs_log_priv.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index de7ef6ca9206..b39a1980e82d 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -245,6 +245,7 @@ typedef struct xlog_ticket {
struct xlog_ticket *t_next; /* :4|8 */
struct xlog_ticket *t_prev; /* :4|8 */
xlog_tid_t t_tid; /* transaction identifier : 4 */
+ atomic_t t_ref; /* ticket reference count : 4 */
int t_curr_res; /* current reservation in bytes : 4 */
int t_unit_res; /* unit reservation in bytes : 4 */
char t_ocnt; /* original count : 1 */