linux-kernel - [PATCH] fix build error in function vfio_combine_iova

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Message-Id: <20230912010736.19481-1-liucong2@kylinos.cn>
Date:   Tue, 12 Sep 2023 09:07:36 +0800
From:   Cong Liu <liucong2@...inos.cn>
To:     alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        liucong2@...inos.cn
Subject: [PATCH] fix build error in function vfio_combine_iova_ranges

when compiling with smatch check, the following errors were encountered:

drivers/vfio/vfio_main.c:957 vfio_combine_iova_ranges() error: uninitialized symbol 'last'.
drivers/vfio/vfio_main.c:978 vfio_combine_iova_ranges() error: potentially dereferencing uninitialized 'comb_end'.
drivers/vfio/vfio_main.c:978 vfio_combine_iova_ranges() error: potentially dereferencing uninitialized 'comb_start'.

this patch fix these error.

Signed-off-by: Cong Liu <liucong2@...inos.cn>
---
 drivers/vfio/vfio_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 40732e8ed4c6..68a0a5081161 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -938,12 +938,13 @@ static int vfio_ioctl_device_feature_migration(struct vfio_device *device,
 void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
 			      u32 req_nodes)
 {
-	struct interval_tree_node *prev, *curr, *comb_start, *comb_end;
+	struct interval_tree_node *prev, *curr;
+	struct interval_tree_node *comb_start = NULL, *comb_end = NULL;
 	unsigned long min_gap, curr_gap;
 
 	/* Special shortcut when a single range is required */
 	if (req_nodes == 1) {
-		unsigned long last;
+		unsigned long last = 0;
 
 		comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
 		curr = comb_start;
-- 
2.34.1

I'm very sorry, I compiled the code on another machine and then copied the wrong patch.