[PATCH v1] erofs: fix possible memory leak in z_erofs_gbuf_exit()

Sandeep Dhavale
2024-06-24T22:02:12Z

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@google.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