diff options
| author |   Bob Peterson <rpeterso@redhat.com> | 2022-01-17 10:25:07 -0500 |
|---|---|---|
| committer |   Andreas Gruenbacher <agruenba@redhat.com> | 2022-02-15 15:01:10 +0100 |
| commit | 428f651cb80b227af47fc302e4931791f2fb4741 (patch) | |
| tree | e68ffcee4b1df3b378463ed63785a37a72de9c14 | |
| parent | Linux 5.17-rc4 (diff) | |
| download | linux-dev-428f651cb80b227af47fc302e4931791f2fb4741.tar.xz linux-dev-428f651cb80b227af47fc302e4931791f2fb4741.zip | |
gfs2: assign rgrp glock before compute_bitstructs
Before this patch, function read_rindex_entry called compute_bitstructs
before it allocated a glock for the rgrp. But if compute_bitstructs found
a problem with the rgrp, it called gfs2_consist_rgrpd, and that called
gfs2_dump_glock for rgd->rd_gl which had not yet been assigned.
read_rindex_entry
compute_bitstructs
gfs2_consist_rgrpd
gfs2_dump_glock <---------rgd->rd_gl was not set.
This patch changes read_rindex_entry so it assigns an rgrp glock before
calling compute_bitstructs so gfs2_dump_glock does not reference an
unassigned pointer. If an error is discovered, the glock must also be
put, so a new goto and label were added.
Reported-by: syzbot+c6fd14145e2f62ca0784@syzkaller.appspotmail.com
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
| -rw-r--r-- | fs/gfs2/rgrp.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 0fb3c01bc557..9b04a570c582 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -922,15 +922,15 @@ static int read_rindex_entry(struct gfs2_inode *ip) spin_lock_init(&rgd->rd_rsspin); mutex_init(&rgd->rd_mutex); - error = compute_bitstructs(rgd); - if (error) - goto fail; - error = gfs2_glock_get(sdp, rgd->rd_addr, &gfs2_rgrp_glops, CREATE, &rgd->rd_gl); if (error) goto fail; + error = compute_bitstructs(rgd); + if (error) + goto fail_glock; + rgd->rd_rgl = (struct gfs2_rgrp_lvb *)rgd->rd_gl->gl_lksb.sb_lvbptr; rgd->rd_flags &= ~GFS2_RDF_PREFERRED; if (rgd->rd_data > sdp->sd_max_rg_data) @@ -944,6 +944,7 @@ static int read_rindex_entry(struct gfs2_inode *ip) } error = 0; /* someone else read in the rgrp; free it and ignore it */ +fail_glock: gfs2_glock_put(rgd->rd_gl); fail: |