From e8fa6b483feebd23ded5eb01afd7a6e82b6078c6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 3 Mar 2009 14:48:36 -0500 Subject: [PATCH] xfs: prevent kernel crash due to corrupted inode log format Andras Korn reported an oops on log replay causes by a corrupted xfs_inode_log_format_t passing a 0 size to kmem_zalloc. This patch handles to small or too large numbers of log regions gracefully by rejecting the log replay with a useful error message. Signed-off-by: Christoph Hellwig Reported-by: Andras Korn Reviewed-by: Eric Sandeen Signed-off-by: Felix Blyakher --- fs/xfs/xfs_log_recover.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 504d540e0e2c..ceeba45e0224 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -1455,10 +1455,19 @@ xlog_recover_add_to_trans( item = item->ri_prev; if (item->ri_total == 0) { /* first region to be added */ - item->ri_total = in_f->ilf_size; - ASSERT(item->ri_total <= XLOG_MAX_REGIONS_IN_ITEM); - item->ri_buf = kmem_zalloc((item->ri_total * - sizeof(xfs_log_iovec_t)), KM_SLEEP); + if (in_f->ilf_size == 0 || + in_f->ilf_size > XLOG_MAX_REGIONS_IN_ITEM) { + xlog_warn( + "XFS: bad number of regions (%d) in inode log format", + in_f->ilf_size); + ASSERT(0); + return XFS_ERROR(EIO); + } + + item->ri_total = in_f->ilf_size; + item->ri_buf = + kmem_zalloc(item->ri_total * sizeof(xfs_log_iovec_t), + KM_SLEEP); } ASSERT(item->ri_total > item->ri_cnt); /* Description region is ri_buf[0] */