Patchwork [v2,2/9] mmc: fix max_discard_sectors

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Submitter NamJae Jeon
Date April 19, 2013, 4:40 p.m.
Message ID <1366389647-19382-1-git-send-email-linkinjeon@gmail.com>
Download mbox | patch
Permalink /patch/238053/
State New
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NamJae Jeon - April 19, 2013, 4:40 p.m.
From: Namjae Jeon <namjae.jeon@samsung.com>

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 <jcmvbkbc@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Vivek Trivedi <t.vivek@samsung.com>
---
 drivers/mmc/card/queue.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

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;