sgi-xp: fix writing past the end of kzalloc()'d space
A missing type cast results in writing way beyond the end of a kzalloc()'d memory segment resulting in slab corruption. But it seems like the better solution is to define ->recv_msg_slots as a 'void *' rather than a 'struct xpc_notify_mq_msg_uv *' and add the type cast. Signed-off-by: Dean Nelson <dcn@sgi.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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361916a943
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@ -3,7 +3,7 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2004-2009 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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@ -514,7 +514,8 @@ struct xpc_channel_uv {
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/* partition's notify mq */
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struct xpc_send_msg_slot_uv *send_msg_slots;
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struct xpc_notify_mq_msg_uv *recv_msg_slots;
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void *recv_msg_slots; /* each slot will hold a xpc_notify_mq_msg_uv */
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/* structure plus the user's payload */
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struct xpc_fifo_head_uv msg_slot_free_list;
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struct xpc_fifo_head_uv recv_msg_list; /* deliverable payloads */
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@ -3,7 +3,7 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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@ -1010,8 +1010,8 @@ xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
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continue;
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for (entry = 0; entry < nentries; entry++) {
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msg_slot = ch_uv->recv_msg_slots + entry *
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ch->entry_size;
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msg_slot = ch_uv->recv_msg_slots +
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entry * ch->entry_size;
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msg_slot->hdr.msg_slot_number = entry;
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}
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@ -1308,9 +1308,8 @@ xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
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/* we're dealing with a normal message sent via the notify_mq */
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ch_uv = &ch->sn.uv;
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msg_slot = (struct xpc_notify_mq_msg_uv *)((u64)ch_uv->recv_msg_slots +
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(msg->hdr.msg_slot_number % ch->remote_nentries) *
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ch->entry_size);
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msg_slot = ch_uv->recv_msg_slots +
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(msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
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BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
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BUG_ON(msg_slot->hdr.size != 0);
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