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gfs2: fix gfs2_find_jhead that returns uninitialized jhead with seq 0
commit7582026f6f
upstream. 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. Fixes:f4686c26ec
("gfs2: read journal in large chunks") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -421,7 +421,7 @@ static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd,
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for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) {
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if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) {
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if (lh.lh_sequence > head->lh_sequence)
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if (lh.lh_sequence >= head->lh_sequence)
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*head = lh;
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else {
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ret = true;
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