From: Pavel Begunkov <asml.sile...@gmail.com>
[ Upstream commit d81269fecb8ce16eb07efafc9ff5520b2a31c486 ]
io_provide_buffers_prep()'s "p->len * p->nbufs" to sign extension
problems. Not a huge problem as it's only used for access_ok() and
increases the checked length, but better to keep typing right.
Reported-by: Colin Ian King <colin.k...@canonical.com>
Fixes: efe68c1ca8f49 ("io_uring: validate the full range of provided buffers
for access")
Signed-off-by: Pavel Begunkov <asml.sile...@gmail.com>
Reviewed-by: Colin Ian King <colin.k...@canonical.com>
Link:
https://lore.kernel.org/r/562376a39509e260d8532186a06226e56eb1f594.1616149233.git.asml.sile...@gmail.com
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
fs/io_uring.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index c3cfaa367138..5c4378694d54 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4214,6 +4214,7 @@ static int io_remove_buffers(struct io_kiocb *req, bool
force_nonblock,
static int io_provide_buffers_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
+ unsigned long size;
struct io_provide_buf *p = &req->pbuf;
u64 tmp;
@@ -4227,7 +4228,8 @@ static int io_provide_buffers_prep(struct io_kiocb *req,
p->addr = READ_ONCE(sqe->addr);
p->len = READ_ONCE(sqe->len);
- if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs)))
+ size = (unsigned long)p->len * p->nbufs;
+ if (!access_ok(u64_to_user_ptr(p->addr), size))
return -EFAULT;
p->bgid = READ_ONCE(sqe->buf_group);
--
2.30.1
