summaryrefslogtreecommitdiffstats
path: root/net/irda
diff options
context:
space:
mode:
authorDan Rosenberg <drosenberg@vsecurity.com>2011-03-19 21:14:30 +0100
committerDavid S. Miller <davem@davemloft.net>2011-03-28 02:59:02 +0200
commitd50e7e3604778bfc2dc40f440e0742dbae399d54 (patch)
tree6ff38b491047533a9cbe74f04e231c14c2a6d0f3 /net/irda
parentdst: Clone child entry in skb_dst_pop (diff)
downloadlinux-d50e7e3604778bfc2dc40f440e0742dbae399d54.tar.xz
linux-d50e7e3604778bfc2dc40f440e0742dbae399d54.zip
irda: prevent heap corruption on invalid nickname
Invalid nicknames containing only spaces will result in an underflow in a memcpy size calculation, subsequently destroying the heap and panicking. v2 also catches the case where the provided nickname is longer than the buffer size, which can result in controllable heap corruption. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Cc: stable@kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/irda')
-rw-r--r--net/irda/irnet/irnet_ppp.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/irda/irnet/irnet_ppp.c b/net/irda/irnet/irnet_ppp.c
index 7c567b8aa89a..2bb2beb6a373 100644
--- a/net/irda/irnet/irnet_ppp.c
+++ b/net/irda/irnet/irnet_ppp.c
@@ -105,6 +105,9 @@ irnet_ctrl_write(irnet_socket * ap,
while(isspace(start[length - 1]))
length--;
+ DABORT(length < 5 || length > NICKNAME_MAX_LEN + 5,
+ -EINVAL, CTRL_ERROR, "Invalid nickname.\n");
+
/* Copy the name for later reuse */
memcpy(ap->rname, start + 5, length - 5);
ap->rname[length - 5] = '\0';