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authorChristoph Hellwig <hch@infradead.org>2009-03-03 14:48:36 -0500
committerFelix Blyakher <felixb@sgi.com>2009-03-04 07:31:42 -0600
commite8fa6b483feebd23ded5eb01afd7a6e82b6078c6 (patch)
tree39bdbcae18f9199c09e62c44136dc4b67bf2284b /fs/xfs/xfs_log_recover.c
parentd4fc7cea5dda04ae1a6f36175ec1dd8ff088ed52 (diff)
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 <hch@lst.de> Reported-by: Andras Korn <korn-sgi.com@chardonnay.math.bme.hu> Reviewed-by: Eric Sandeen <sandeen@sandeen.net> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log_recover.c')
-rw-r--r--fs/xfs/xfs_log_recover.c17
1 files 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] */