Kernel 2.4.32 and earlier can panic when trying to read a corrupted
sector from an IDE disk.
The function ide_dma_timeout_retry can end a request early by calling
idedisk_error, but then goes on to use the request anyway causing a
kernel panic due to a null pointer exception. This patch fixes that.
Regards,
Chris R.
diff -urN -X dontdiff linux-2.4.32/drivers/ide/ide-io.c
patched-linux-2.4.32/drivers/ide/ide-io.c
--- linux-2.4.32/drivers/ide/ide-io.c 2003-11-28 18:26:20.000000000 +0000
+++ patched-linux-2.4.32/drivers/ide/ide-io.c 2005-11-23
12:33:37.000000000 +0000
@@ -899,11 +899,13 @@
rq = HWGROUP(drive)->rq;
HWGROUP(drive)->rq = NULL;
- rq->errors = 0;
- rq->sector = rq->bh->b_rsector;
- rq->current_nr_sectors = rq->bh->b_size >> 9;
- rq->hard_cur_sectors = rq->current_nr_sectors;
- rq->buffer = rq->bh->b_data;
+ if (rq) {
+ rq->errors = 0;
+ rq->sector = rq->bh->b_rsector;
+ rq->current_nr_sectors = rq->bh->b_size >> 9;
+ rq->hard_cur_sectors = rq->current_nr_sectors;
+ rq->buffer = rq->bh->b_data;
+ }
return ret;
}
-
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