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From: Shreyansh Chouhan <>
Cc: Shreyansh Chouhan <>,,,
Subject: [RESEND PATCH] loop: fix setting arbitrarily large block size
Date: Wed, 23 Jun 2021 10:39:33 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

REASON FOR RESEND: Fixed spelling of the Reported-by tag.

loop_validate_block_size took an unsigned short argument. Passing an
argument with size greater than the size of unsigned short would cause
an overflow and could potentially render the upper bound check on the
block size useless, allowing to set an arbitrarily large block size.

Signed-off-by: Shreyansh Chouhan <>
 drivers/block/loop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 9a758cf66507..635baff0dd66 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -236,7 +236,7 @@ static void __loop_update_dio(struct loop_device *lo, bool dio)
  * @bsize: size to validate
 static int
-loop_validate_block_size(unsigned short bsize)
+loop_validate_block_size(unsigned long bsize)
 	if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
 		return -EINVAL;

  reply	other threads:[~2021-06-23  5:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-22 16:10 [PATCH] loop: fix setting arbitrarily large block size Shreyansh Chouhan
2021-06-23  5:09 ` Shreyansh Chouhan [this message]
2021-06-24  6:14   ` [RESEND PATCH] " Christoph Hellwig
2021-06-26  8:24   ` [PATCH v2] " Shreyansh Chouhan
2021-06-28  5:34     ` Christoph Hellwig
2021-07-20  7:25     ` Shreyansh Chouhan

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