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tests/server/dnsd: fix potential buffer overflow

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When handling incoming DNS packets.

Reported-by: Joshua Rogers

Closes #19261
This commit is contained in:
Viktor Szakats 2025-10-27 19:23:37 +01:00
parent 73811b4c51
commit fa49c50ac3
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GPG key ID: B5ABD165E2AEF201
1 changed files with 8 additions and 2 deletions
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10
tests/server/dnsd.c
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@ -83,7 +83,7 @@ static const char *type2string(unsigned short qtype)
* Return query (qname + type + class), type and id.
*/
static int store_incoming(const unsigned char *data, size_t size,
unsigned char *qbuf, size_t *qlen,
unsigned char *qbuf, size_t qbuflen, size_t *qlen,
unsigned short *qtype, unsigned short *idp)
{
FILE *server;
@ -159,6 +159,12 @@ static int store_incoming(const unsigned char *data, size_t size,
(void) get16bit(&data, &size);
*qlen = qsize - size; /* total size of the query */
if(*qlen > qbuflen) {
logmsg("dnsd: query too large: %lu > %lu",
(unsigned long)*qlen, (unsigned long)qbuflen);
fclose(server);
return -1;
}
memcpy(qbuf, qptr, *qlen);
}
else
@ -616,7 +622,7 @@ static int test_dnsd(int argc, char **argv)
per test case */
read_instructions();
store_incoming(inbuffer, n, qbuf, &qlen, &qtype, &id);
store_incoming(inbuffer, n, qbuf, sizeof(qbuf), &qlen, &qtype, &id);
set_advisor_read_lock(loglockfile);
serverlogslocked = 1;