[PATCH 1/1] lib: rsa: fix data abort in br_i32_decode()

[Heinrich Schuchardt]

After removing leading zeros the RSA modulus may be unaligned. On
architectures like ARM 32bit unaligned access may lead to a data abort,
e.g. when executing 'ut lib lib_asn1_pkcs7'.

Use memcpy() to transfer from unaligned to aligned memory.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 lib/rsa/rsa-keyprop.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/lib/rsa/rsa-keyprop.c b/lib/rsa/rsa-keyprop.c
index 1e83eedc82..6153cb00b3 100644
--- a/lib/rsa/rsa-keyprop.c
+++ b/lib/rsa/rsa-keyprop.c
@@ -17,23 +17,29 @@
 #include <u-boot/rsa-mod-exp.h>

 /**
- * br_dec16be() - Convert 16-bit big-endian integer to native
- * @src:	Pointer to data
- * Return:	Native-endian integer
+ * br_dec16be() - convert unaligned 16-bit big-endian integer to native
+ * @src:	unaligned pointer to data
+ * Return:	native-endian 16-bit integer
  */
 static unsigned br_dec16be(const void *src)
 {
-	return be16_to_cpup(src);
+	u16 buf;
+
+	memcpy(&buf, src, sizeof(buf));
+	return be16_to_cpu(buf);
 }

 /**
- * br_dec32be() - Convert 32-bit big-endian integer to native
- * @src:	Pointer to data
- * Return:	Native-endian integer
+ * br_dec32be() - convert unaligned 32-bit big-endian integer to native
+ * @src:	unaligned pointer to data
+ * Return:	native-endian 32-bit integer
  */
 static uint32_t br_dec32be(const void *src)
 {
-	return be32_to_cpup(src);
+	u32 buf;
+
+	memcpy(&buf, src, sizeof(buf));
+	return be32_to_cpu(buf);
 }

 /**
--
2.20.1