This is a note to let you know that I've just added the patch titled
NFS: Fix an off by one in root_nfs_cat()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-fix-an-off-by-one-in-root_nfs_cat.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 25c748ab7e89b4434a2381481d4556b751b316c0
Author: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Date: Sun Feb 18 22:16:53 2024 +0100
NFS: Fix an off by one in root_nfs_cat()
[ Upstream commit 698ad1a538da0b6bf969cfee630b4e3a026afb87 ]
The intent is to check if 'dest' is truncated or not. So, >= should be
used instead of >, because strlcat() returns the length of 'dest' and 'src'
excluding the trailing NULL.
Fixes: 56463e50d1fc ("NFS: Use super.c for NFSROOT mount option parsing")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Reviewed-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index effaa4247b912..c0f2e1751c33e 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -169,10 +169,10 @@ static int __init root_nfs_cat(char *dest, const char *src,
size_t len = strlen(dest);
if (len && dest[len - 1] != ',')
- if (strlcat(dest, ",", destlen) > destlen)
+ if (strlcat(dest, ",", destlen) >= destlen)
return -1;
- if (strlcat(dest, src, destlen) > destlen)
+ if (strlcat(dest, src, destlen) >= destlen)
return -1;
return 0;
}
