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netdev: Allow NULL prefix in netdev_frame_watch_add

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Make sure we don't pass NULLs to memcmp or l_memdup when the prefix
buffer is NULL.  There's no point having callers pass dummy buffers if
they need to watch frames independent of the frame data.
This commit is contained in:
Andrew Zaborowski 2019-01-15 07:34:05 +01:00 committed by Denis Kenzior
parent 8aa306fddc
commit 52b3268b78
1 changed files with 3 additions and 2 deletions
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src/netdev.c
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@ -3676,7 +3676,8 @@ static bool netdev_frame_watch_match_prefix(const void *a, const void *b)
return fw->frame_type == info->frame_type &&
fw->prefix_len <= info->body_len &&
!memcmp(fw->prefix, info->body, fw->prefix_len);
(fw->prefix_len == 0 ||
!memcmp(fw->prefix, info->body, fw->prefix_len));
}
static void netdev_mgmt_frame_event(struct l_genl_msg *msg,
@ -4594,7 +4595,7 @@ uint32_t netdev_frame_watch_add(struct netdev *netdev, uint16_t frame_type,
fw = l_new(struct netdev_frame_watch, 1);
fw->frame_type = frame_type;
fw->prefix = l_memdup(prefix, prefix_len);
fw->prefix = prefix_len ? l_memdup(prefix, prefix_len) : NULL;
fw->prefix_len = prefix_len;
id = watchlist_link(&netdev->frame_watches, &fw->super,
handler, user_data, NULL);