[Cluster-devel] [GFS2 PATCH] gfs2: Fix possible fs name overflows

[Bob Peterson]

Hi,

This patch fixes three places in which temporary character buffers
could overflow due to the addition of the file system id from patch
3792ce973f07. Thanks to Dan Carpenter for pointing it out.

Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
 fs/gfs2/glock.c | 2 +-
 fs/gfs2/rgrp.c  | 2 +-
 fs/gfs2/util.c  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index e23fb8b7b020..a27dbd3dec01 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1788,8 +1788,8 @@ void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid)
 	unsigned long long dtime;
 	const struct gfs2_holder *gh;
 	char gflags_buf[32];
-	char fs_id_buf[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];
 	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+	char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
 
 	memset(fs_id_buf, 0, sizeof(fs_id_buf));
 	if (fsid && sdp) /* safety precaution */
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 49ac0a5e74ea..2466bb44a23c 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -2285,7 +2285,7 @@ void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_glock *gl,
 static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
 {
 	struct gfs2_sbd *sdp = rgd->rd_sbd;
-	char fs_id_buf[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];
+	char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
 
 	fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
 		(unsigned long long)rgd->rd_addr);
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 83f6c582773a..c45159133d8e 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -178,7 +178,7 @@ int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 			 const char *function, char *file, unsigned int line)
 {
 	struct gfs2_sbd *sdp = rgd->rd_sbd;
-	char fs_id_buf[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];
+	char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
 	int rv;
 
 	sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);