From 421b8fb4e95938cdd4221954ef86a26c6bb436cb Mon Sep 17 00:00:00 2001
From: Andriy Skulysh <andriy.skulysh@hpe.com>
Date: Fri, 3 Jun 2022 15:28:14 +0300
Subject: [PATCH] LU-16333 osc: page fault in osc_release_bounce_pages()

pga[i] can be uninitialized. It happens after following
code path in osc_build_rpc():

        OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
        if (oa == NULL)
                GOTO(out, rc = -ENOMEM);

Fixes: a9ed5b149646 ("LU-12275 sec: encryption for write path")
HPE-bug-id: LUS-10991
Signed-off-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <c17825@cray.com>
Change-Id: I7e21cb9ab69f0bce9c1bdb53a4b0ac7a673887cc
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49210
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
---
 lustre/osc/osc_request.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lustre/osc/osc_request.c b/lustre/osc/osc_request.c
index 56e8b7d..08a286d 100644
--- a/lustre/osc/osc_request.c
+++ b/lustre/osc/osc_request.c
@@ -1461,6 +1461,9 @@ static inline void osc_release_bounce_pages(struct brw_page **pga,
 	struct page **pa = NULL;
 	int i, j = 0;
 
+	if (!pga[0])
+		return;
+
 #ifdef CONFIG_LL_ENCRYPTION
 	if (PageChecked(pga[0]->pg)) {
 		OBD_ALLOC_PTR_ARRAY_LARGE(pa, page_count);
-- 
1.8.3.1