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Fix memcpy() UB in mbedtls_asn1_named_data()

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Removes a case in mbedtls_asn1_named_data() where memcpy() could be
called with a null pointer and zero length. A test case is added for
this code path, to catch the undefined behavior when running tests with
UBSan.

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
This commit is contained in:
Werner Lewis
2022-05-04 09:44:50 +01:00
parent 585a412129
commit 12ddae870c
3 changed files with 9 additions and 8 deletions
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2
library/asn1write.c
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@ -472,7 +472,7 @@ mbedtls_asn1_named_data *mbedtls_asn1_store_named_data(
cur->val.len = val_len;
}
if( val != NULL )
if( val != NULL && val_len != 0 )
memcpy( cur->val.p, val, val_len );
return( cur );