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authorDave Chinner <david@fromorbit.com>2009-01-22 15:37:47 +1100
committerFelix Blyakher <felixb@sgi.com>2009-02-03 11:01:32 -0600
commit6139a2360987f55e4490a7813cf69df74ec8b93a (patch)
tree650a4ac7ef9181b0e98cae627728eae2b260c33d /fs
parent6d2160bfe7826aca1c94b4bca77093908a452ae7 (diff)
downloadlinux-6139a2360987f55e4490a7813cf69df74ec8b93a.tar.gz
xfs: Check buffer lengths in log recovery
Before trying to obtain, read or write a buffer, check that the buffer length is actually valid. If it is not valid, then something read in the recovery process has been corrupted and we should abort recovery. Reported-by: Eric Sesterhenn <snakebyte@gmx.de> Tested-by: Eric Sesterhenn <snakebyte@gmx.de> Reviewed-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Felix Blyakher <felixb@sgi.com> Signed-off-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_log_recover.c31
1 files changed, 25 insertions, 6 deletions
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 35cca98bd94..b1047de2fff 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -70,16 +70,21 @@ STATIC void xlog_recover_check_summary(xlog_t *);
xfs_buf_t *
xlog_get_bp(
xlog_t *log,
- int num_bblks)
+ int nbblks)
{
- ASSERT(num_bblks > 0);
+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer", nbblks);
+ XFS_ERROR_REPORT("xlog_get_bp(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return NULL;
+ }
if (log->l_sectbb_log) {
- if (num_bblks > 1)
- num_bblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
- num_bblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, num_bblks);
+ if (nbblks > 1)
+ nbblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
+ nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
}
- return xfs_buf_get_noaddr(BBTOB(num_bblks), log->l_mp->m_logdev_targp);
+ return xfs_buf_get_noaddr(BBTOB(nbblks), log->l_mp->m_logdev_targp);
}
void
@@ -102,6 +107,13 @@ xlog_bread(
{
int error;
+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer", nbblks);
+ XFS_ERROR_REPORT("xlog_bread(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return EFSCORRUPTED;
+ }
+
if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
@@ -139,6 +151,13 @@ xlog_bwrite(
{
int error;
+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer", nbblks);
+ XFS_ERROR_REPORT("xlog_bwrite(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return EFSCORRUPTED;
+ }
+
if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);