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io_uring: Allocate only necessary memory in io_probe

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We write at most IORING_OP_LAST entries in the probe buffer, so we don't
need to allocate temporary space for more than that.  As a side effect,
we no longer can overflow "size".

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20240619020620.5301-3-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gabriel Krisman Bertazi 2024-06-18 22:06:19 -04:00 committed by Jens Axboe
parent 3e05b22238
commit 6bc9199d0c
1 changed files with 3 additions and 4 deletions
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7
io_uring/register.c
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@ -39,9 +39,10 @@ static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg,
size_t size;
int i, ret;
if (nr_args > IORING_OP_LAST)
nr_args = IORING_OP_LAST;
size = struct_size(p, ops, nr_args);
if (size == SIZE_MAX)
return -EOVERFLOW;
p = kzalloc(size, GFP_KERNEL);
if (!p)
return -ENOMEM;
@ -54,8 +55,6 @@ static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg,
goto out;
p->last_op = IORING_OP_LAST - 1;
if (nr_args > IORING_OP_LAST)
nr_args = IORING_OP_LAST;
for (i = 0; i < nr_args; i++) {
p->ops[i].op = i;