Change in libosmocore[master]: tlv_parser: Fix various out-of-bounds accesses

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pespin gerrit-no-reply at lists.osmocom.org
Tue Jan 12 17:23:20 UTC 2021


pespin has posted comments on this change. ( https://gerrit.osmocom.org/c/libosmocore/+/22113 )

Change subject: tlv_parser: Fix various out-of-bounds accesses
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Patch Set 2:

(1 comment)

https://gerrit.osmocom.org/c/libosmocore/+/22113/1/src/gsm/tlv_parser.c 
File src/gsm/tlv_parser.c:

https://gerrit.osmocom.org/c/libosmocore/+/22113/1/src/gsm/tlv_parser.c@259 
PS1, Line 259: 		*o_val = buf+1;
in here you are actually assigning a pointer to buf[1] with buf_len = 1, which doesn't look good to me. Shouldn't this be "if (buf_len < 2)" ?

Same with all below.

I understand that's probably caught by the last check in the function at the end, but still coverity or/and ASan may don't like this (assigning a pointer to an address which may be out of allocated memory, hence to uninitialized memory).



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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I98b02c914c9e3ecf56050af846292aa6979d7508
Gerrit-Change-Number: 22113
Gerrit-PatchSet: 2
Gerrit-Owner: laforge <laforge at osmocom.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-Comment-Date: Tue, 12 Jan 2021 17:23:20 +0000
Gerrit-HasComments: Yes
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