From: Namjae Jeon <[email protected]>
https://lkml.org/lkml/2013/4/1/292
As per above discussion, there is possibility that request's __data_len
field may overflow when max_discard_sectors greater than UINT_MAX >> 9
If multiple discard requests get merged, merged discard request's
size exceeds 4GB, there is possibility that merged discard request's
__data_len field may overflow.
This patch fixes this issue.
Reported-by: Max Filippov <[email protected]>
Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Vivek Trivedi <[email protected]>
---
drivers/mmc/card/queue.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 9447a0e..54726b7 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -166,7 +166,7 @@ static void mmc_queue_setup_discard(struct request_queue *q,
return;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
- q->limits.max_discard_sectors = max_discard;
+ blk_queue_max_discard_sectors(q, max_discard);
if (card->erased_byte == 0 && !mmc_can_discard(card))
q->limits.discard_zeroes_data = 1;
q->limits.discard_granularity = card->pref_erase << 9;
--
1.7.9.5