[Bug 1904954] Re: lan9118 bug peeked received message size not equal to actual received message size

[alfred gedeon]

We do have some code, that is giving different results, between the
peeked and the actual:

https://github.com/FreeRTOS/FreeRTOS-Plus-
TCP/blob/9a25860e761036a9eb780799c9db632e3eff60c9/portable/NetworkInterface/MPS2_AN385/NetworkInterface.c#L237

We also have a fix to circumvent the problem by just reading the actual
size and omit the peeked bytes.

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/pull/142

changing the code i pointed locally worked fine, but we can't expect all
our users to compile qemu from scratch and apply a patch

Alfred

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https://bugs.launchpad.net/bugs/1904954

Title:
  lan9118 bug peeked received message size not equal to actual received
  message size

Status in QEMU:
  In Progress

Bug description:
  peeked message size is not equal to read message size

  Bug in the code at line:
  https://github.com/qemu/qemu/blob/master/hw/net/lan9118.c#L1209

  s->tx_status_fifo_head should be s->rx_status_fifo_head

  Could also be a security bug, as the user could allocate a buffer of
  size peeked data smaller than the actual packet received, which could
  cause a buffer overflow.

  Thanks,

  Alfred

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