linux-kernel - [PATCH v1] erofs: fix possible memory leak in z_erofs_gbuf

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Date: Mon, 24 Jun 2024 15:02:05 -0700
From: Sandeep Dhavale <dhavale@...gle.com>
To: linux-erofs@...ts.ozlabs.org, Gao Xiang <xiang@...nel.org>, 
	Chao Yu <chao@...nel.org>, Yue Hu <huyue2@...lpad.com>, 
	Jeffle Xu <jefflexu@...ux.alibaba.com>, Sandeep Dhavale <dhavale@...gle.com>, 
	Chunhai Guo <guochunhai@...o.com>
Cc: hsiangkao@...ux.alibaba.com, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] erofs: fix possible memory leak in z_erofs_gbuf_exit()

Because we incorrectly reused of variable `i` in `z_erofs_gbuf_exit()`
for inner loop, we may exit early from outer loop resulting in memory
leak. Fix this by using separate variable for iterating through inner loop.

Fixes: f36f3010f676 ("erofs: rename per-CPU buffers to global buffer pool and make it configurable")

Signed-off-by: Sandeep Dhavale <dhavale@...gle.com>
---
 fs/erofs/zutil.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c
index 036024bce9f7..b80f612867c2 100644
--- a/fs/erofs/zutil.c
+++ b/fs/erofs/zutil.c
@@ -148,7 +148,7 @@ int __init z_erofs_gbuf_init(void)
 
 void z_erofs_gbuf_exit(void)
 {
-	int i;
+	int i, j;
 
 	for (i = 0; i < z_erofs_gbuf_count + (!!z_erofs_rsvbuf); ++i) {
 		struct z_erofs_gbuf *gbuf = &z_erofs_gbufpool[i];
@@ -161,9 +161,9 @@ void z_erofs_gbuf_exit(void)
 		if (!gbuf->pages)
 			continue;
 
-		for (i = 0; i < gbuf->nrpages; ++i)
-			if (gbuf->pages[i])
-				put_page(gbuf->pages[i]);
+		for (j = 0; j < gbuf->nrpages; ++j)
+			if (gbuf->pages[j])
+				put_page(gbuf->pages[j]);
 		kfree(gbuf->pages);
 		gbuf->pages = NULL;
 	}
-- 
2.45.2.741.gdbec12cfda-goog