From: Tobias Oetiker <tobi@oetiker.ch>
Date: Tue, 26 May 2026 15:35:03 +0000 (+0200)
Subject: Merge branch 'master' into fix-1291-xgrid-segfault
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=f2b7f673a948a045f85b6875a2fecd80fdced209;p=thirdparty%2Frrdtool-1.x.git

Merge branch 'master' into fix-1291-xgrid-segfault
---

f2b7f673a948a045f85b6875a2fecd80fdced209
diff --cc CHANGES
index fe9ac1c2,7a7fd94e..442d561c
--- a/CHANGES
+++ b/CHANGES
@@@ -3,14 -3,11 +3,19 @@@ RRDtool - master ..
  ====================
  Bugfixes
  --------
 +* Fix segfault when `--x-grid` is given without a trailing date-format
 +  field. The `%n` conversion in `sscanf()` is not counted in its return
 +  value, so `stroff` remained uninitialized when the input ended before
 +  the final `:` separator; the subsequent `stroff != 0` guard read
 +  garbage and could branch into `strdup()` with a bogus offset. Fixed by
 +  initialising `stroff = 0` so a partial match safely falls through to
 +  the existing "invalid x-grid format" error path. Issue #1291
 +  reported by @anvilvapre, fixed by @oetiker
+ * libdbi /derive now returns 0 instead of NaN when the underlying
+   counter is constant (zero delta). Previously the strict `d_value > 0`
+   guard skipped zero deltas the same way it skips negative ones (counter
+   resets). Changed to `d_value >= 0`. Issue #550 reported by
+   @bitionaire, fix by @oetiker.
  * Fix a 1-byte heap buffer overflow in `checkUnusedValues()` that
    triggered `*** buffer overflow detected ***` SIGABRT under glibc
    fortified `strcat()` when reporting unused graph arguments. The