linux-kernel - [PATCH][next] erofs: fix uninitialized variable i used in a while-loop

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue,  6 Apr 2021 17:27:18 +0100
From:   Colin King <colin.king@...onical.com>
To:     Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-erofs@...ts.ozlabs.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] erofs: fix uninitialized variable i used in a while-loop

From: Colin Ian King <colin.king@...onical.com>

The while-loop iterates until src is non-null or i is 3, however, the
loop counter i is not intinitialied to zero, causing incorrect iteration
counts.  Fix this by initializing it to zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 1aa5f2e2feed ("erofs: support decompress big pcluster for lz4 backend")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/erofs/decompressor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index fe46a9c34923..8687ff81406b 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -154,6 +154,7 @@ static void *z_erofs_handle_inplace_io(struct z_erofs_decompress_req *rq,
 	}
 	kunmap_atomic(inpage);
 	might_sleep();
+	i = 0;
 	while (1) {
 		src = vm_map_ram(rq->in, nrpages_in, -1);
 		/* retry two more times (totally 3 times) */
-- 
2.30.2