[PATCH] smb: client: free partially allocated transform folio queue

[Yichong Chen]

netfs_alloc_folioq_buffer() may leave a partially allocated folio
queue attached to the caller's buffer pointer when it returns an error.

smb3_init_transform_rq() stores the buffer in the request only after
allocation succeeds, so the common error path cannot free a partial
allocation. Store the buffer pointer before checking the return value so
err_free releases it.

Signed-off-by: Yichong Chen <chenyichong@xxxxxxxxxxxxx>
---
 fs/smb/client/smb2ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 199f6aeb7b33..3fe9f0534e42 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -4882,10 +4882,10 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
 			size_t cur_size = 0;
 			rc = netfs_alloc_folioq_buffer(NULL, &buffer, &cur_size,
 						       size, GFP_NOFS);
+			new->rq_buffer = buffer;
 			if (rc < 0)
 				goto err_free;
 
-			new->rq_buffer = buffer;
 			iov_iter_folio_queue(&new->rq_iter, ITER_SOURCE,
 					     buffer, 0, 0, size);
 
-- 
2.51.0