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Fix NULL dereference in buffer-based allocator

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Manuel Pégourié-Gonnard 2014-11-26 15:42:16 +01:00 committed by Paul Bakker
parent 765bb31d24
commit 547ff6618f
2 changed files with 8 additions and 1 deletions
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6
ChangeLog
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@ -9,6 +9,12 @@ Features
* Add support for Extended Master Secret (draft-ietf-tls-session-hash)
* Add support for Encrypt-then-MAC (RFC 7366)
Security
* NULL pointer dereference in the buffer-based allocator when the buffer is
full and polarssl_free() is called (found by Jean-Philippe Aumasson)
(only possible if POLARSSL_MEMORY_BUFFER_ALLOC_C is enabled, which it is
not by default).
Bugfix
* Stack buffer overflow if ctr_drbg_update() is called with too large
add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).

3
library/memory_buffer_alloc.c
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@ -484,7 +484,8 @@ static void buffer_alloc_free( void *ptr )
if( old == NULL )
{
hdr->next_free = heap.first_free;
heap.first_free->prev_free = hdr;
if( heap.first_free != NULL )
heap.first_free->prev_free = hdr;
heap.first_free = hdr;
}