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batman-adv: frag: free unfragmentable packet

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The caller of batadv_frag_send_packet() assume that the skb provided to the
function are always consumed. But the pre-check for an empty payload or the
zero fragment size returned an error without any further actions.

A failed pre-check must use the same error handling code as the rest of the
function.

Cc: stable@vger.kernel.org
Fixes: ee75ed8887 ("batman-adv: Fragment and send skbs larger than mtu")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Sven Eckelmann 2026-07-03 20:28:31 +02:00
parent 7a581d9aab
commit 6b628425ae
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1 changed files with 4 additions and 2 deletions
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6
net/batman-adv/fragmentation.c
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@ -518,8 +518,10 @@ int batadv_frag_send_packet(struct sk_buff *skb,
mtu = min_t(unsigned int, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
max_fragment_size = mtu - header_size;
if (skb->len == 0 || max_fragment_size == 0)
return -EINVAL;
if (skb->len == 0 || max_fragment_size == 0) {
ret = -EINVAL;
goto free_skb;
}
num_fragments = (skb->len - 1) / max_fragment_size + 1;
max_fragment_size = (skb->len - 1) / num_fragments + 1;