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net: ax25: fix information leak to userland

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Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater
field of fsa struct, also the struct has padding bytes between
sax25_call and sax25_ndigis fields.  This structure is then copied to
userland.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasiliy Kulikov 2010-11-10 10:14:33 -08:00 committed by David S. Miller
parent 332dd96f7a
commit fe10ae5338
1 changed files with 1 additions and 1 deletions
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net/ax25/af_ax25.c
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@ -1392,6 +1392,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
ax25_cb *ax25;
int err = 0;
memset(fsa, 0, sizeof(fsa));
lock_sock(sk);
ax25 = ax25_sk(sk);
@ -1403,7 +1404,6 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
fsa->fsa_ax25.sax25_family = AF_AX25;
fsa->fsa_ax25.sax25_call = ax25->dest_addr;
fsa->fsa_ax25.sax25_ndigis = 0;
if (ax25->digipeat != NULL) {
ndigi = ax25->digipeat->ndigi;