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* [PATCH AUTOSEL 5.4 30/40] io_uring: fix sq array offset calculation
       [not found] <[email protected]>
@ 2020-08-08 23:38 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2020-08-08 23:38 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Dmitry Vyukov, Hristo Venev, io-uring, Jens Axboe, Sasha Levin,
	linux-fsdevel

From: Dmitry Vyukov <[email protected]>

[ Upstream commit b36200f543ff07a1cb346aa582349141df2c8068 ]

rings_size() sets sq_offset to the total size of the rings (the returned
value which is used for memory allocation). This is wrong: sq array should
be located within the rings, not after them. Set sq_offset to where it
should be.

Fixes: 75b28affdd6a ("io_uring: allocate the two rings together")
Signed-off-by: Dmitry Vyukov <[email protected]>
Acked-by: Hristo Venev <[email protected]>
Cc: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 fs/io_uring.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e0200406765c3..265981ca3109c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3400,6 +3400,9 @@ static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries,
 		return SIZE_MAX;
 #endif
 
+	if (sq_offset)
+		*sq_offset = off;
+
 	sq_array_size = array_size(sizeof(u32), sq_entries);
 	if (sq_array_size == SIZE_MAX)
 		return SIZE_MAX;
@@ -3407,9 +3410,6 @@ static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries,
 	if (check_add_overflow(off, sq_array_size, &off))
 		return SIZE_MAX;
 
-	if (sq_offset)
-		*sq_offset = off;
-
 	return off;
 }
 
-- 
2.25.1


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