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#4506 'crash from memory corruption somewhere called from tr_handshakeDone()' -- possible fix.

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This commit is contained in:
Jordan Lee 2011-09-28 16:07:35 +00:00
parent 1aefd9f1de
commit 0337806b03
1 changed files with 18 additions and 9 deletions
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27
libtransmission/bitfield.c
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@ -170,25 +170,27 @@ tr_bitfieldGetRaw( const tr_bitfield * b, size_t * byte_count )
assert( b->bit_count > 0 );
if( b->alloc_count )
if( b->alloc_count ) {
assert( b->alloc_count <= n );
memcpy( bits, b->bits, b->alloc_count );
else if( tr_bitfieldHasAll( b ) )
} else if( tr_bitfieldHasAll( b ) ) {
set_all_true( bits, b->bit_count );
}
*byte_count = n;
return bits;
}
static void
tr_bitfieldEnsureBitsAlloced( tr_bitfield * b, size_t nth )
tr_bitfieldEnsureBitsAlloced( tr_bitfield * b, size_t n )
{
size_t bytes_needed;
const bool has_all = tr_bitfieldHasAll( b );
if( has_all )
bytes_needed = get_bytes_needed( MAX( nth, b->true_count ) + 1 );
bytes_needed = get_bytes_needed( MAX( n, b->true_count ) );
else
bytes_needed = get_bytes_needed( nth + 1 );
bytes_needed = get_bytes_needed( n );
if( b->alloc_count < bytes_needed )
{
@ -201,6 +203,13 @@ tr_bitfieldEnsureBitsAlloced( tr_bitfield * b, size_t nth )
}
}
static void
tr_bitfieldEnsureNthBitAlloced( tr_bitfield * b, size_t nth )
{
/* count is zero-based, so we need to allocate nth+1 bits before setting the nth */
tr_bitfieldEnsureBitsAlloced( b, nth + 1 );
}
static void
tr_bitfieldFreeArray( tr_bitfield * b )
{
@ -332,7 +341,7 @@ tr_bitfieldAdd( tr_bitfield * b, size_t nth )
{
if( !tr_bitfieldHas( b, nth ) )
{
tr_bitfieldEnsureBitsAlloced( b, nth );
tr_bitfieldEnsureNthBitAlloced( b, nth );
b->bits[nth >> 3u] |= ( 0x80 >> ( nth & 7u ) );
tr_bitfieldIncTrueCount( b, 1 );
}
@ -358,7 +367,7 @@ tr_bitfieldAddRange( tr_bitfield * b, size_t begin, size_t end )
eb = end >> 3;
em = 0xff << ( 7 - ( end & 7 ) );
tr_bitfieldEnsureBitsAlloced( b, end );
tr_bitfieldEnsureNthBitAlloced( b, end );
if( sb == eb )
{
b->bits[sb] |= ( sm & em );
@ -381,7 +390,7 @@ tr_bitfieldRem( tr_bitfield * b, size_t nth )
if( !tr_bitfieldHas( b, nth ) )
{
tr_bitfieldEnsureBitsAlloced( b, nth );
tr_bitfieldEnsureNthBitAlloced( b, nth );
b->bits[nth >> 3u] &= ( 0xff7f >> ( nth & 7u ) );
tr_bitfieldIncTrueCount( b, -1 );
}
@ -408,7 +417,7 @@ tr_bitfieldRemRange( tr_bitfield * b, size_t begin, size_t end )
eb = end >> 3;
em = ~( 0xff << ( 7 - ( end & 7 ) ) );
tr_bitfieldEnsureBitsAlloced( b, end );
tr_bitfieldEnsureNthBitAlloced( b, end );
if( sb == eb )
{
b->bits[sb] &= ( sm | em );