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| author | Jens Axboe <axboe@kernel.dk> | 2025-04-07 07:51:23 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-04-07 07:51:23 -0600 |
| commit | cf960726eb65e8d0bfecbcce6cf95f47b1ffa6cc (patch) | |
| tree | 72dc0009a183968b05f9d0749f8d15620e40b3de | |
| parent | 5a17131a5dbd0ebca655bfb65fe3fe643ccc27f3 (diff) | |
| download | linux-cf960726eb65e8d0bfecbcce6cf95f47b1ffa6cc.tar.gz linux-cf960726eb65e8d0bfecbcce6cf95f47b1ffa6cc.tar.bz2 linux-cf960726eb65e8d0bfecbcce6cf95f47b1ffa6cc.zip | |
io_uring/kbuf: reject zero sized provided buffers
This isn't fixing a real issue, but there's also zero point in going
through group and buffer setup, when the buffers are going to be
rejected once attempted to get used.
Cc: stable@vger.kernel.org
Reported-by: syzbot+58928048fd1416f1457c@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | io_uring/kbuf.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index 098109259671..953d5e742569 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -504,6 +504,8 @@ int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe p->nbufs = tmp; p->addr = READ_ONCE(sqe->addr); p->len = READ_ONCE(sqe->len); + if (!p->len) + return -EINVAL; if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, &size)) |