[PATCH 7/8] jq: patch CVE-2026-43894

[Anton Skorup <antonsk@axis.com>]

From: Anton Skorup <anton@skorup.se>

CVE details: https://www.cve.org/CVERecord?id=CVE-2026-43894

Signed-off-by: Anton Skorup <anton.skorup@axis.com>
---
 .../jq/jq/CVE-2026-43894.patch                | 52 +++++++++++++++++++
 meta-oe/recipes-devtools/jq/jq_1.8.1.bb       |  1 +
 2 files changed, 53 insertions(+)
 create mode 100644 meta-oe/recipes-devtools/jq/jq/CVE-2026-43894.patch

diff --git a/meta-oe/recipes-devtools/jq/jq/CVE-2026-43894.patch b/meta-oe/recipes-devtools/jq/jq/CVE-2026-43894.patch
new file mode 100644
index 0000000000..3b73647de0
--- /dev/null
+++ b/meta-oe/recipes-devtools/jq/jq/CVE-2026-43894.patch
@@ -0,0 +1,52 @@
+From 9761ceb7d6cc48c16b25f0ab1baaef0e701927e4 Mon Sep 17 00:00:00 2001
+From: itchyny <itchyny@cybozu.co.jp>
+Date: Wed, 6 May 2026 19:45:24 +0900
+Subject: [PATCH] Reject numeric literals longer than DEC_MAX_DIGITS
+ (999999999)
+
+A signed-int overflow in decNumber's D2U macro lets huge literals
+write attacker-controlled bytes past a stack buffer. Cap the length
+before calling decNumberFromString, and pre-slice long strings in
+jv_dump_string_trunc so the resulting error message doesn't itself
+allocate a multi-GiB buffer.
+
+Fixes CVE-2026-43894.
+
+Signed-off-by: Anton Skorup
+Upstream-Status: Backport [https://github.com/jqlang/jq/commit/9761ceb7d6cc48c16b25f0ab1baaef0e701927e4]
+---
+ src/jv.c       | 5 ++++-
+ src/jv_print.c | 4 ++++
+ 2 files changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/src/jv.c b/src/jv.c
+index 84fafef666..074ee310c5 100644
+--- a/src/jv.c
++++ b/src/jv.c
+@@ -570,7 +570,10 @@ static jvp_literal_number* jvp_literal_number_alloc(unsigned literal_length) {
+ }
+ 
+ static jv jvp_literal_number_new(const char * literal) {
+-  jvp_literal_number* n = jvp_literal_number_alloc(strlen(literal));
++  size_t len = strlen(literal);
++  if (len > DEC_MAX_DIGITS)
++    return JV_INVALID;
++  jvp_literal_number* n = jvp_literal_number_alloc(len);
+ 
+   decContext *ctx = DEC_CONTEXT();
+   decContextClearStatus(ctx, DEC_Conversion_syntax);
+diff --git a/src/jv_print.c b/src/jv_print.c
+index 5c86c5d97c..bc251070f7 100644
+--- a/src/jv_print.c
++++ b/src/jv_print.c
+@@ -410,6 +410,10 @@ jv jv_dump_string(jv x, int flags) {
+ 
+ char *jv_dump_string_trunc(jv x, char *outbuf, size_t bufsize) {
+   assert(bufsize > 0);
++  if (jv_get_kind(x) == JV_KIND_STRING &&
++      (size_t)jv_string_length_bytes(jv_copy(x)) > bufsize) {
++    x = jv_string_slice(x, 0, bufsize);
++  }
+   x = jv_dump_string(x, 0);
+   const char *str = jv_string_value(x);
+   const size_t len = strlen(str);
diff --git a/meta-oe/recipes-devtools/jq/jq_1.8.1.bb b/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
index 0653dcd1f1..0e3e22c65b 100644
--- a/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
+++ b/meta-oe/recipes-devtools/jq/jq_1.8.1.bb
@@ -20,6 +20,7 @@ SRC_URI = "git://github.com/jqlang/jq.git;protocol=https;branch=master;tag=jq-${
            file://CVE-2026-40612.patch \
            file://CVE-2026-41256.patch \
            file://CVE-2026-41257.patch \
+           file://CVE-2026-43894.patch \
            file://CVE-2026-43896.patch \
            file://CVE-2026-44777.patch \
            file://CVE-2026-49389.patch \
-- 
2.43.0