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io_uring: io_allocate_scq_urings() should return a sane state 

We currently rely on the ring destroy on cleaning things up in case of
failure, but io_allocate_scq_urings() can leave things half initialized
if only parts of it fails.

Be nice and return with either everything setup in success, or return an
error with things nicely cleaned up.

Reported-by: syzbot+0d818c0d39399188f393@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-11-20 09:26:29 -07:00
parent bbad27b2f6
commit eb065d301e
1 changed files with 8 additions and 2 deletions
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10
fs/io_uring.c
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@ -4583,12 +4583,18 @@ static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
ctx->cq_entries = rings->cq_ring_entries; ctx->cq_entries = rings->cq_ring_entries;
size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); size = array_size(sizeof(struct io_uring_sqe), p->sq_entries);
if (size == SIZE_MAX) if (size == SIZE_MAX) {
io_mem_free(ctx->rings);
ctx->rings = NULL;
return -EOVERFLOW; return -EOVERFLOW;
}
ctx->sq_sqes = io_mem_alloc(size); ctx->sq_sqes = io_mem_alloc(size);
if (!ctx->sq_sqes) if (!ctx->sq_sqes) {
io_mem_free(ctx->rings);
ctx->rings = NULL;
return -ENOMEM; return -ENOMEM;
}
return 0; return 0;
} }