libosmo-netif[master]: osmux: Re-write osmux_snprintf

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Pablo Neira Ayuso gerrit-no-reply at lists.osmocom.org
Mon Sep 4 17:47:50 UTC 2017


Patch Set 3:

(1 comment)

https://gerrit.osmocom.org/#/c/3537/3/src/osmux.c
File src/osmux.c:

Line 918: 		SNPRINTF_BUFFER_SIZE(ret, buf_offset, size);
> I have no idea if the code initially fetching the AMR size from RTP is doin
OK, I'm reviewing this function.

It seems this check is not working.

if (msg_len < sizeof(struct osmux_hdr)) 

msg_len is int, while sizeof is unsigned.

C takes the left hand side of the relational as unsigned, so this branch never evaluates true.

Then, we start accessing out of bound memory area.


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Gerrit-MessageType: comment
Gerrit-Change-Id: I695771d099833842db37a415b636035d17f1bba7
Gerrit-PatchSet: 3
Gerrit-Project: libosmo-netif
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Holger Freyther <holger at freyther.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Pablo Neira Ayuso <pablo at gnumonks.org>
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-HasComments: Yes



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