From 6a379f67454a3c740671ed6c7793b76ffecef50b Mon Sep 17 00:00:00 2001 From: Wenwen Wang Date: Mon, 19 Aug 2019 16:55:04 -0500 Subject: [PATCH] jffs2: Fix memory leak in jffs2_scan_eraseblock() error path In jffs2_scan_eraseblock(), 'sumptr' is allocated through kmalloc() if 'sumlen' is larger than 'buf_size'. However, it is not deallocated in the following execution if jffs2_fill_scan_buf() fails, leading to a memory leak bug. To fix this issue, free 'sumptr' before returning the error. Signed-off-by: Wenwen Wang Signed-off-by: Richard Weinberger --- fs/jffs2/scan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c index 90431dd613b8..5f7e284e0df3 100644 --- a/fs/jffs2/scan.c +++ b/fs/jffs2/scan.c @@ -527,8 +527,11 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo err = jffs2_fill_scan_buf(c, sumptr, jeb->offset + c->sector_size - sumlen, sumlen - buf_len); - if (err) + if (err) { + if (sumlen > buf_size) + kfree(sumptr); return err; + } } } -- 2.30.2