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firewire: nosy: ensure user_length is taken into account when fetching packet contents 

Ensure that packet_buffer_get respects the user_length provided. If
the length of the head packet exceeds the user_length, packet_buffer_get
will now return 0 to signify to the user that no data were read
and a larger buffer size is required. Helps prevent user space overflows.

Signed-off-by: Thanassis Avgerinos <thanassis.avgerinos@gmail.com>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
This commit is contained in:
Thanassis Avgerinos 2024-04-17 11:30:02 -04:00 committed by Takashi Sakamoto
parent e67572cd22
commit 38762a0763
1 changed files with 4 additions and 2 deletions
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6
drivers/firewire/nosy.c
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@ -148,10 +148,12 @@ packet_buffer_get(struct client *client, char __user *data, size_t user_length)
if (atomic_read(&buffer->size) == 0)
return -ENODEV;
/* FIXME: Check length <= user_length. */
length = buffer->head->length;
if (length > user_length)
return 0;
end = buffer->data + buffer->capacity;
length = buffer->head->length;
if (&buffer->head->data[length] < end) {
if (copy_to_user(data, buffer->head->data, length))