lmdb: patch CVE-2026-22185

Details: https://nvd.nist.gov/vuln/detail/CVE-2026-22185

Pick the patch that is mentioned as a solution in the related upstream bug[1].

[1]: https://bugs.openldap.org/show_bug.cgi?id=10421

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-dbs/lmdb/files/CVE-2026-22185.patch

@@ -0,0 +1,31 @@
+From 94ca20e5aed5d8730e045bb945fa3485b28a7981 Mon Sep 17 00:00:00 2001
+From: Gyorgy Sarvari <skandigraun@gmail.com>
+Date: Tue, 6 Jan 2026 20:52:25 +0000
+Subject: [PATCH] ITS#10421 mdb_load: check for malicious input
+
+From: Howard Chu <hyc@openldap.org>
+
+CVE: CVE-2026-22185
+Upstream-Status: Backport [https://github.com/LMDB/lmdb/commit/8e1fda85532a3c74276df38a42d234dcdfa1e40d]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ libraries/liblmdb/mdb_load.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/libraries/liblmdb/mdb_load.c b/libraries/liblmdb/mdb_load.c
+index d2a3cec..7eccf40 100644
+--- a/libraries/liblmdb/mdb_load.c
++++ b/libraries/liblmdb/mdb_load.c
+@@ -208,6 +208,12 @@ badend:
+ 
+ 	c1 = buf->mv_data;
+ 	len = strlen((char *)c1);
++	if (!len) {
++		/* This can only happen with an intentionally invalid input
++		 * with a NUL byte after the leading SPACE
++		 */
++		goto badend;
++	}
+ 	l2 = len;
+ 
+ 	/* Is buffer too short? */

meta-oe/recipes-dbs/lmdb/lmdb_0.9.31.bb

@@ -12,6 +12,7 @@ SRC_URI = "git://github.com/LMDB/lmdb.git;nobranch=1;protocol=https \
            file://run-ptest \
            file://0001-Makefile-use-libprefix-instead-of-libdir.patch \
            file://0001-make-set-soname-on-liblmdb.patch;patchdir=../.. \
+           file://CVE-2026-22185.patch;striplevel=3 \
            "
 
 SRCREV = "ce201088de95d26fc0da36ba805bf2ddc2ba74ff"