[Cluster-devel] [GFS2 PATCH v2] gfs2: fix gfs2_find_jhead that returns uninitialized jhead with seq 0
Abhi Das
adas at redhat.com
Tue Feb 4 20:14:56 UTC 2020
Hi,
This version changes the description as per discussion with Andreas.
Cheers!
--Abhi
When the first log header in a journal happens to have a sequence
number of 0, a bug in gfs2_find_jhead() causes it to prematurely exit,
and return an uninitialized jhead with seq 0. This can cause failures
in the caller. For instance, a mount fails in one test case.
The correct behavior is for it to continue searching through the journal
to find the correct journal head with the highest sequence number.
Signed-off-by: Abhi Das <adas at redhat.com>
---
fs/gfs2/lops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index d9431724b788..c090d5ad3f22 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -422,7 +422,7 @@ static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd,
for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) {
if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) {
- if (lh.lh_sequence > head->lh_sequence)
+ if (lh.lh_sequence >= head->lh_sequence)
*head = lh;
else {
ret = true;
--
2.20.1
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