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Merge pull request #5802 from wernerlewis/asn1_memcpy_null_2.28

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[Backport 2.28] Fix memcpy() UB in mbedtls_asn1_named_data()
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Paul Elliott 2022-05-04 23:20:34 +01:00 committed by GitHub
commit 9a0c8ed030
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4 changed files with 12 additions and 8 deletions
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3
ChangeLog.d/fix-undefined-memcpy-mbedtls_asn1_named_data.txt Normal file
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@ -0,0 +1,3 @@
Bugfix
* Fix undefined behavior in mbedtls_asn1_find_named_data(), where val is
not NULL and val_len is zero.

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 );

9
tests/suites/test_suite_asn1write.data
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@ -374,10 +374,13 @@ Store named data: found, larger data
store_named_data_val_found:4:9
Store named data: new, val_len=0
store_named_data_val_new:0
store_named_data_val_new:0:1
Stored named data: new, val_len=0, val=NULL
store_named_data_val_new:0:0
Store named data: new, val_len=4
store_named_data_val_new:4
store_named_data_val_new:4:1
Store named data: new, val_len=4, val=NULL
store_named_data_val_new:-4
store_named_data_val_new:4:0

6
tests/suites/test_suite_asn1write.function
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@ -431,7 +431,7 @@ exit:
/* END_CASE */
/* BEGIN_CASE */
void store_named_data_val_new( int new_len )
void store_named_data_val_new( int new_len, int set_new_val )
{
mbedtls_asn1_named_data *head = NULL;
mbedtls_asn1_named_data *found = NULL;
@ -439,10 +439,8 @@ void store_named_data_val_new( int new_len )
size_t oid_len = strlen( (const char *) oid );
const unsigned char *new_val = (unsigned char *) "new value";
if( new_len <= 0 )
if( set_new_val == 0 )
new_val = NULL;
if( new_len < 0 )
new_len = - new_len;
found = mbedtls_asn1_store_named_data( &head,
(const char *) oid, oid_len,