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lib: protect printfrr extensions from NULL input

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Protect the lib printfrr extension handlers from NULL inputs.

Signed-off-by: Mark Stapp <mjs@voltanet.io>
This commit is contained in:
Mark Stapp 2021-03-01 15:41:30 -05:00
parent 001ab42b19
commit 8e2c653ed3
3 changed files with 79 additions and 43 deletions
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26
lib/prefix.c
View File

@ -1366,7 +1366,11 @@ static ssize_t printfrr_ea(char *buf, size_t bsz, const char *fmt,
{ {
const struct ethaddr *mac = ptr; const struct ethaddr *mac = ptr;
if (mac)
prefix_mac2str(mac, buf, bsz); prefix_mac2str(mac, buf, bsz);
else
strlcpy(buf, "NULL", bsz);
return 2; return 2;
} }
@ -1376,7 +1380,11 @@ static ssize_t printfrr_ia(char *buf, size_t bsz, const char *fmt,
{ {
const struct ipaddr *ipa = ptr; const struct ipaddr *ipa = ptr;
if (ipa)
ipaddr2str(ipa, buf, bsz); ipaddr2str(ipa, buf, bsz);
else
strlcpy(buf, "NULL", bsz);
return 2; return 2;
} }
@ -1384,7 +1392,11 @@ printfrr_ext_autoreg_p("I4", printfrr_i4)
static ssize_t printfrr_i4(char *buf, size_t bsz, const char *fmt, static ssize_t printfrr_i4(char *buf, size_t bsz, const char *fmt,
int prec, const void *ptr) int prec, const void *ptr)
{ {
if (ptr)
inet_ntop(AF_INET, ptr, buf, bsz); inet_ntop(AF_INET, ptr, buf, bsz);
else
strlcpy(buf, "NULL", bsz);
return 2; return 2;
} }
@ -1392,7 +1404,11 @@ printfrr_ext_autoreg_p("I6", printfrr_i6)
static ssize_t printfrr_i6(char *buf, size_t bsz, const char *fmt, static ssize_t printfrr_i6(char *buf, size_t bsz, const char *fmt,
int prec, const void *ptr) int prec, const void *ptr)
{ {
if (ptr)
inet_ntop(AF_INET6, ptr, buf, bsz); inet_ntop(AF_INET6, ptr, buf, bsz);
else
strlcpy(buf, "NULL", bsz);
return 2; return 2;
} }
@ -1400,7 +1416,11 @@ printfrr_ext_autoreg_p("FX", printfrr_pfx)
static ssize_t printfrr_pfx(char *buf, size_t bsz, const char *fmt, static ssize_t printfrr_pfx(char *buf, size_t bsz, const char *fmt,
int prec, const void *ptr) int prec, const void *ptr)
{ {
if (ptr)
prefix2str(ptr, buf, bsz); prefix2str(ptr, buf, bsz);
else
strlcpy(buf, "NULL", bsz);
return 2; return 2;
} }
@ -1411,6 +1431,7 @@ static ssize_t printfrr_psg(char *buf, size_t bsz, const char *fmt,
const struct prefix_sg *sg = ptr; const struct prefix_sg *sg = ptr;
struct fbuf fb = { .buf = buf, .pos = buf, .len = bsz - 1 }; struct fbuf fb = { .buf = buf, .pos = buf, .len = bsz - 1 };
if (sg) {
if (sg->src.s_addr == INADDR_ANY) if (sg->src.s_addr == INADDR_ANY)
bprintfrr(&fb, "(*,"); bprintfrr(&fb, "(*,");
else else
@ -1422,5 +1443,10 @@ static ssize_t printfrr_psg(char *buf, size_t bsz, const char *fmt,
bprintfrr(&fb, "%pI4)", &sg->grp); bprintfrr(&fb, "%pI4)", &sg->grp);
fb.pos[0] = '\0'; fb.pos[0] = '\0';
} else {
strlcpy(buf, "NULL", bsz);
}
return 3; return 3;
} }

5
lib/sockunion.c
View File

@ -673,6 +673,7 @@ static ssize_t printfrr_psu(char *buf, size_t bsz, const char *fmt,
bool endflags = false; bool endflags = false;
ssize_t consumed = 2; ssize_t consumed = 2;
if (su) {
while (!endflags) { while (!endflags) {
switch (fmt[consumed++]) { switch (fmt[consumed++]) {
case 'p': case 'p':
@ -706,6 +707,10 @@ static ssize_t printfrr_psu(char *buf, size_t bsz, const char *fmt,
} }
fb.pos[0] = '\0'; fb.pos[0] = '\0';
} else {
strlcpy(buf, "NULL", bsz);
}
return consumed; return consumed;
} }

5
lib/srcdest_table.c
View File

@ -313,8 +313,13 @@ static ssize_t printfrr_rn(char *buf, size_t bsz, const char *fmt,
const struct route_node *rn = ptr; const struct route_node *rn = ptr;
const struct prefix *dst_p, *src_p; const struct prefix *dst_p, *src_p;
if (rn) {
srcdest_rnode_prefixes(rn, &dst_p, &src_p); srcdest_rnode_prefixes(rn, &dst_p, &src_p);
srcdest2str(dst_p, (const struct prefix_ipv6 *)src_p, buf, bsz); srcdest2str(dst_p, (const struct prefix_ipv6 *)src_p, buf, bsz);
} else {
strlcpy(buf, "NULL", bsz);
}
return 2; return 2;
} }