diff options
| author | Gabriel Krisman Bertazi | 2023-10-04 20:05:30 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-11-20 11:52:00 +0100 |
| commit | 32b15fef33e8cd067eb4b1bbfa5c73c967b14f93 (patch) | |
| tree | f3344b9a5e941ec5bd07a2b264df6bbbb7963132 /io_uring | |
| parent | 60db638be5f4eb6cecb1de86c545008784ccd749 (diff) | |
io_uring/kbuf: Allow the full buffer id space for provided buffers
[ Upstream commit f74c746e476b9dad51448b9a9421aae72b60e25f ]
nbufs tracks the number of buffers and not the last bgid. In 16-bit, we
have 2^16 valid buffers, but the check mistakenly rejects the last
bid. Let's fix it to make the interface consistent with the
documentation.
Fixes: ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS")
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20231005000531.30800-3-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/kbuf.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index e45602b02a9f..57ef6850c6a8 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -19,12 +19,15 @@ #define BGID_ARRAY 64 +/* BIDs are addressed by a 16-bit field in a CQE */ +#define MAX_BIDS_PER_BGID (1 << 16) + struct io_provide_buf { struct file *file; __u64 addr; __u32 len; __u32 bgid; - __u16 nbufs; + __u32 nbufs; __u16 bid; }; @@ -281,7 +284,7 @@ int io_remove_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return -EINVAL; tmp = READ_ONCE(sqe->fd); - if (!tmp || tmp > USHRT_MAX) + if (!tmp || tmp > MAX_BIDS_PER_BGID) return -EINVAL; memset(p, 0, sizeof(*p)); @@ -327,7 +330,7 @@ int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe return -EINVAL; tmp = READ_ONCE(sqe->fd); - if (!tmp || tmp > USHRT_MAX) + if (!tmp || tmp > MAX_BIDS_PER_BGID) return -E2BIG; p->nbufs = tmp; p->addr = READ_ONCE(sqe->addr); @@ -347,7 +350,7 @@ int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe tmp = READ_ONCE(sqe->off); if (tmp > USHRT_MAX) return -E2BIG; - if (tmp + p->nbufs > USHRT_MAX) + if (tmp + p->nbufs > MAX_BIDS_PER_BGID) return -EINVAL; p->bid = tmp; return 0; |