6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
[ Upstream commit d4bc0a264fb482b019c84fbc7202dd3cab059087 ]
The overflow/underflow conditions in pata_macio_qc_prep() should never
happen. But if they do there's no need to kill the system entirely, a
WARN and failing the IO request should be sufficient and might allow the
system to keep running.
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/ata/pata_macio.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 17f6ccee53c7..ffbb2e8591ce 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -541,7 +541,8 @@ static enum ata_completion_errors pata_macio_qc_prep(struct ata_queued_cmd *qc)
while (sg_len) {
/* table overflow should never happen */
- BUG_ON (pi++ >= MAX_DCMDS);
+ if (WARN_ON_ONCE(pi >= MAX_DCMDS))
+ return AC_ERR_SYSTEM;
len = (sg_len < MAX_DBDMA_SEG) ? sg_len : MAX_DBDMA_SEG;
table->command = cpu_to_le16(write ? OUTPUT_MORE: INPUT_MORE);
@@ -553,11 +554,13 @@ static enum ata_completion_errors pata_macio_qc_prep(struct ata_queued_cmd *qc)
addr += len;
sg_len -= len;
++table;
+ ++pi;
}
}
/* Should never happen according to Tejun */
- BUG_ON(!pi);
+ if (WARN_ON_ONCE(!pi))
+ return AC_ERR_SYSTEM;
/* Convert the last command to an input/output */
table--;
--
2.43.0
