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Subject[PATCH][next] io_uring: Fix memory leak on error return path.
Date
From: Colin Ian King <colin.king@canonical.com>

Currently the -EINVAL error return path is leaking memory allocated
to data. Fix this by kfree'ing data before the return.

Addresses-Coverity: ("Resource leak")
Fixes: c3a40789f6ba ("io_uring: allow empty slots for reg buffers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
fs/io_uring.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 47c2f126f885..beeb477e4f6a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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)
+ if (!iov.iov_base && tag) {
+ kfree(data);
return -EINVAL;
+ }

ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
&last_hpage);
--
2.30.2
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