Commit 6139a236 authored by Dave Chinner's avatar Dave Chinner Committed by Felix Blyakher

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: default avatarEric Sesterhenn <snakebyte@gmx.de>
Tested-by: default avatarEric Sesterhenn <snakebyte@gmx.de>
Reviewed-by: default avatarChristoph Hellwig <hch@infradead.org>
Reviewed-by: default avatarFelix Blyakher <felixb@sgi.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
Signed-off-by: default avatarFelix Blyakher <felixb@sgi.com>
parent 6d2160bf
...@@ -70,16 +70,21 @@ STATIC void xlog_recover_check_summary(xlog_t *); ...@@ -70,16 +70,21 @@ STATIC void xlog_recover_check_summary(xlog_t *);
xfs_buf_t * xfs_buf_t *
xlog_get_bp( xlog_get_bp(
xlog_t *log, 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 (log->l_sectbb_log) {
if (num_bblks > 1) if (nbblks > 1)
num_bblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1); nbblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
num_bblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, num_bblks); 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 void
...@@ -102,6 +107,13 @@ xlog_bread( ...@@ -102,6 +107,13 @@ xlog_bread(
{ {
int error; 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) { if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no); blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks); nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
...@@ -139,6 +151,13 @@ xlog_bwrite( ...@@ -139,6 +151,13 @@ xlog_bwrite(
{ {
int error; 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) { if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no); blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks); nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
......
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