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io_uring: Fix premature return from loop and memory leak 

Currently the -EINVAL error return path is leaking memory allocated
to data. Fix this by not returning immediately but instead setting
the error return variable to -EINVAL and breaking out of the loop.

Kudos to Pavel Begunkov for suggesting a correct fix.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/20210429104602.62676-1-colin.king@canonical.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Colin Ian King 2021-04-29 11:46:02 +01:00 committed by Jens Axboe
parent 47b228ce6f
commit cf3770e784
1 changed files with 8 additions and 4 deletions
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12
fs/io_uring.c
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@ -8417,8 +8417,10 @@ static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
ret = io_buffer_validate(&iov);
if (ret)
break;
if (!iov.iov_base && tag)
return -EINVAL;
if (!iov.iov_base && tag) {
ret = -EINVAL;
break;
}
ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
&last_hpage);
@ -8468,8 +8470,10 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
err = io_buffer_validate(&iov);
if (err)
break;
if (!iov.iov_base && tag)
return -EINVAL;
if (!iov.iov_base && tag) {
err = -EINVAL;
break;
}
err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage);
if (err)
break;