From: Dan Rosenberg Date: Sat, 19 Mar 2011 20:14:30 +0000 (+0000) Subject: irda: prevent heap corruption on invalid nickname X-Git-Tag: firefly_0821_release~7613^2~1737^2~26 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d50e7e3604778bfc2dc40f440e0742dbae399d54;p=firefly-linux-kernel-4.4.55.git 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 Cc: stable@kernel.org Signed-off-by: David S. Miller --- 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';