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| author | Dmitry Vyukov <dvyukov@google.com> | 2020-07-11 11:31:11 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-07-24 12:55:44 -0600 |
| commit | b36200f543ff07a1cb346aa582349141df2c8068 (patch) | |
| tree | 412713127dde3057c7b037eae9bb72390ed6d17d /fs/io_uring.c | |
| parent | 760618f7a8e3b63aa06266efb301719c374e29d4 (diff) | |
| download | lwn-b36200f543ff07a1cb346aa582349141df2c8068.tar.gz lwn-b36200f543ff07a1cb346aa582349141df2c8068.zip | |
io_uring: fix sq array offset calculation
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 <dvyukov@google.com>
Acked-by: Hristo Venev <hristo@venev.name>
Cc: io-uring@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index ff3851d40df4..ca932fb3c67d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7416,6 +7416,9 @@ 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; @@ -7423,9 +7426,6 @@ 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; } |