From: Andreas Gruenbacher agruenba@redhat.com
[ Upstream commit 204c0300c4e99707e9fb6e57840aa1127060e63f ]
Switch from strlcpy to strscpy and make sure that @count is the size of the smaller of the source and destination buffers. This prevents reading beyond the end of the source buffer when the source string isn't null terminated.
Found by a modified version of syzkaller.
Suggested-by: Wolfram Sang wsa+renesas@sang-engineering.com Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/gfs2/ops_fstype.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 7f8410d8fdc1..f461a365eb38 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -385,8 +385,10 @@ static int init_names(struct gfs2_sbd *sdp, int silent) if (!table[0]) table = sdp->sd_vfs->s_id;
- strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); - strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); + BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN); + + strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN); + strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
table = sdp->sd_table_name; while ((table = strchr(table, '/'))) @@ -1443,13 +1445,13 @@ static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
switch (o) { case Opt_lockproto: - strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); + strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); break; case Opt_locktable: - strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); + strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); break; case Opt_hostdata: - strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); + strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); break; case Opt_spectator: args->ar_spectator = 1;