[PATCH] ide-scsi: kmap scatter/gather before doing PIO

From: Stuart Hayes <Stuart_Hayes@dell.com>

The system can panic with a null pointer dereference using ide-scsi if
PIO is being done on scatter gather pages that are in high memory,
because page_address() returns 0.  We are actually seeing this using a
tape drive.  This patch will kmap_atomic() the pages before performing
PIO.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>

1 files changed, 24 insertions, 4 deletions

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index d80c4c9d5a63..83f062ed9082 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -179,8 +179,18 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
                         return;
                 }
                 count = min(pc->sg->length - pc->b_count, bcount);
-                buf = page_address(pc->sg->page) + pc->sg->offset;
-                drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
+                if (PageHighMem(pc->sg->page)) {
+                        unsigned long flags;
+
+                        local_irq_save(flags);
+                        buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
+                        drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
+                        kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
+                        local_irq_restore(flags);
+                } else {
+                        buf = page_address(pc->sg->page) + pc->sg->offset;
+                        drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
+                }
                 bcount -= count; pc->b_count += count;
                 if (pc->b_count == pc->sg->length) {
                         pc->sg++;
@@ -201,8 +211,18 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
                         return;
                 }
                 count = min(pc->sg->length - pc->b_count, bcount);
-                buf = page_address(pc->sg->page) + pc->sg->offset;
-                drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
+                if (PageHighMem(pc->sg->page)) {
+                        unsigned long flags;
+
+                        local_irq_save(flags);
+                        buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
+                        drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
+                        kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
+                        local_irq_restore(flags);
+                } else {
+                        buf = page_address(pc->sg->page) + pc->sg->offset;
+                        drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
+                }
                 bcount -= count; pc->b_count += count;
                 if (pc->b_count == pc->sg->length) {
                         pc->sg++;