[lwip-devel] [bug #27576] pbuf_realloc will assert or crash on a non-chained pbuf list

[Bill Auerbach]

Follow-up Comment #11, bug #27576 (project lwip):

Since you're talking about including this in ethernetif.c, I would think a
little more documentation in low_level_input on what is expected of the
returned pbuf is sufficient.  I didn't need a runtime check as much as I
simply needed to know what the requirements are doing my Ethernet driver.

In low_level_input:

"If you have read the Ethernet packet into a preallocated pbuf in an
interrupt service routine, ensure the tot_len member of the pbuf is the sum of
the chained pbuf len members."

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