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io_uring: fix regbuf vector size truncation 

There is a report of io_estimate_bvec_size() truncating the calculated
number of segments that leads to corruption issues. Check it doesn't
overflow "int"s used later. Rough but simple, can be improved on top.

Cc: stable@vger.kernel.org
Fixes: 9ef4cbbcb4 ("io_uring: add infra for importing vectored reg buffers")
Reported-by: Google Big Sleep <big-sleep-vuln-reports+bigsleep-458654612@google.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Günther Noack <gnoack@google.com>
Tested-by: Günther Noack <gnoack@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-11-07 18:41:26 +00:00 committed by Jens Axboe
parent 1fd5367391
commit 146eb58629
1 changed files with 9 additions and 2 deletions
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11
io_uring/rsrc.c
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@ -1403,8 +1403,11 @@ static int io_estimate_bvec_size(struct iovec *iov, unsigned nr_iovs,
size_t max_segs = 0;
unsigned i;
for (i = 0; i < nr_iovs; i++)
for (i = 0; i < nr_iovs; i++) {
max_segs += (iov[i].iov_len >> shift) + 2;
if (max_segs > INT_MAX)
return -EOVERFLOW;
}
return max_segs;
}
@ -1510,7 +1513,11 @@ int io_import_reg_vec(int ddir, struct iov_iter *iter,
if (unlikely(ret))
return ret;
} else {
nr_segs = io_estimate_bvec_size(iov, nr_iovs, imu);
int ret = io_estimate_bvec_size(iov, nr_iovs, imu);
if (ret < 0)
return ret;
nr_segs = ret;
}
if (sizeof(struct bio_vec) > sizeof(struct iovec)) {