mbedtls: fix arm32 build errors with GCC 15.3

It seems that GCC 15.3 has added additional OOB checks for ARCH arm32.

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/23774
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>

diff --git a/package/libs/mbedtls/patches/102-fix-arm32-build-error-against-GCC-15.3.patch b/package/libs/mbedtls/patches/102-fix-arm32-build-error-against-GCC-15.3.patch
new file mode 100644 (file)
index 0000000..0fbd185
--- /dev/null
+++ b/package/libs/mbedtls/patches/102-fix-arm32-build-error-against-GCC-15.3.patch
@@ -0,0 +1,32 @@
+From: Shiji Yang <yangshiji66@outlook.com>
+Date: Sat, 13 Jun 2026 22:10:28 +0800
+Subject: [PATCH] fix arm32 build errors against GCC 15.3
+
+In file included from /home/db/owrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/mbedtls-3.6.6/library/aes.c:14:
+In function 'mbedtls_xor_no_simd',
+    inlined from 'mbedtls_aes_crypt_cbc' at /home/db/owrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/mbedtls-3.6.6/library/aes.c:1119:13:
+/home/db/owrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/mbedtls-3.6.6/library/common.h:343:24: error: array subscript 16 is outside array bounds of 'unsigned char[16]' [-Werror=array-bounds=]
+  343 |         r[i] = a[i] ^ b[i];
+      |                       ~^~~
+/home/db/owrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/mbedtls-3.6.6/library/aes.c: In function 'mbedtls_aes_crypt_cbc':
+/home/db/owrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/mbedtls-3.6.6/library/aes.c:1075:41: note: at offset 16 into object 'iv' of size [0, 16]
+ 1075 |                           unsigned char iv[16],
+      |                           ~~~~~~~~~~~~~~^~~~~~
+
+Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
+---
+ library/common.h | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/library/common.h
++++ b/library/common.h
+@@ -332,7 +332,8 @@ static inline void mbedtls_xor_no_simd(u
+         uint32_t x = mbedtls_get_unaligned_uint32(a + i) ^ mbedtls_get_unaligned_uint32(b + i);
+         mbedtls_put_unaligned_uint32(r + i, x);
+     }
+-#if defined(__IAR_SYSTEMS_ICC__)
++#if defined(__IAR_SYSTEMS_ICC__) || \
++    (defined(MBEDTLS_ARCH_IS_ARM32) && defined(MBEDTLS_COMPILER_IS_GCC) && MBEDTLS_GCC_VERSION >= 150300)
+     if (n % 4 == 0) {
+         return;
+     }