Dear Sir/Madam,
I believe I have detected and a bug in the inetutils tftpd daemon,
causing a tftpd daemon to hang forever if no ACK is received.
In the code, the setjmp and longjmp calls are used, to go into timeout
and resend the data again, when an acknowledge message is not received after
sending data.
However on my target system (powerpc8555 running inetutils-1.4.2), some of the
tftpd daemons hang because of missing ACK's. And are not killed after 25
seconds
as should have been done by the code.
It seems to go through the timeout function once, but then never make it out
of the recv (that was waiting for ACK) again. Causing the daemon to hang
forever
waiting for data it will never get (the client board requesting a file, sent a
new RRQ
for the same file)
So something went wrong with the alarm not timing-out again.
Replacing all longjmp's with siglongjmp's, and all setjmp with
sigsetjmp (and adding SIGALRM as the 2nd argument), fixed this "hanging tftpd
issue"
(lines 437: longjmp, line 464: setjmp, 529: setjmp)
With kind regards,
H.Heutinck
