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net: core: inet[46]_pton strlen len types

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inet[46]_pton check the input length against
a sane length limit (INET[6]_ADDRSTRLEN), but
the strlen value gets truncated due to being stored in an int,
so there's a theoretical potential for a >4G string to pass
the limit test.
Use size_t since that's what strlen actually returns.

I've had a hunt for callers that could hit this, but
I've not managed to find anything that doesn't get checked with
some other limit first; but it's possible that I've missed
something in the depth of the storage target paths.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20221029014604.114024-1-linux@treblig.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dr. David Alan Gilbert 2022-10-29 02:46:04 +01:00 committed by Jakub Kicinski
parent 6f1a298b2e
commit 44827016be
1 changed files with 2 additions and 2 deletions
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4
net/core/utils.c
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@ -302,7 +302,7 @@ static int inet4_pton(const char *src, u16 port_num,
struct sockaddr_storage *addr)
{
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
int srclen = strlen(src);
size_t srclen = strlen(src);
if (srclen > INET_ADDRSTRLEN)
return -EINVAL;
@ -322,7 +322,7 @@ static int inet6_pton(struct net *net, const char *src, u16 port_num,
{
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
const char *scope_delim;
int srclen = strlen(src);
size_t srclen = strlen(src);
if (srclen > INET6_ADDRSTRLEN)
return -EINVAL;