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Tighten up a lot of casts from unsigned to int which are read by one

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of the GET_32BIT macros and then used as length fields. Missing bounds
checks against zero have been added, and also I've introduced a helper
function toint() which casts from unsigned to int in such a way as to
avoid C undefined behaviour, since I'm not sure I trust compilers any
more to do the obviously sensible thing.

[originally from svn r9918]
This commit is contained in:
Simon Tatham
2013-07-14 10:45:54 +00:00
parent 1662a2f6cf
commit 896bb7c74d
11 changed files with 185 additions and 70 deletions
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3
unix/uxagentc.c
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@ -75,13 +75,12 @@ static int agent_select_result(int fd, int event)
}
conn->retlen += ret;
if (conn->retsize == 4 && conn->retlen == 4) {
conn->retsize = GET_32BIT(conn->retbuf);
conn->retsize = toint(GET_32BIT(conn->retbuf) + 4);
if (conn->retsize <= 0) {
conn->retbuf = NULL;
conn->retlen = 0;
goto done;
}
conn->retsize += 4;
assert(conn->retbuf == conn->sizebuf);
conn->retbuf = snewn(conn->retsize, char);
memcpy(conn->retbuf, conn->sizebuf, 4);