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isdn: Partially revert debug format string usage clean up 

Commit 35a4a57 ("isdn: clean up debug format string usage") introduced
a safeguard to avoid accidential format string interpolation of data
when calling debugl1 or HiSax_putstatus. This did however not take into
account VHiSax_putstatus (called by HiSax_putstatus) does *not* call
vsprintf if the head parameter is NULL - the format string is treated
as plain text then instead. As a result, the string "%s" is processed
literally, and the actual information is lost. This affects the isdnlog
userspace program which stopped logging information since that commit.

So revert the HiSax_putstatus invocations to the previous state.

Fixes: 35a4a5733b ("isdn: clean up debug format string usage")
Cc: Kees Cook <keescook@chromium.org>
Cc: Karsten Keil <isdn@linux-pingi.de>
Signed-off-by: Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Biedl 2015-11-25 07:47:40 +01:00 committed by David S. Miller
parent 8c7188b234
commit 19cebbcb04
4 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/isdn/hisax/config.c
View File

@ -1896,7 +1896,7 @@ static void EChannel_proc_rcv(struct hisax_d_if *d_if)
ptr--;
*ptr++ = '\n';
*ptr = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
} else
HiSax_putstatus(cs, "LogEcho: ",
"warning Frame too big (%d)",

2
drivers/isdn/hisax/hfc_pci.c
View File

@ -901,7 +901,7 @@ Begin:
ptr--;
*ptr++ = '\n';
*ptr = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
} else
HiSax_putstatus(cs, "LogEcho: ", "warning Frame too big (%d)", total - 3);
}

2
drivers/isdn/hisax/hfc_sx.c
View File

@ -674,7 +674,7 @@ receive_emsg(struct IsdnCardState *cs)
ptr--;
*ptr++ = '\n';
*ptr = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
} else
HiSax_putstatus(cs, "LogEcho: ", "warning Frame too big (%d)", skb->len);
}

6
drivers/isdn/hisax/q931.c
View File

@ -1179,7 +1179,7 @@ LogFrame(struct IsdnCardState *cs, u_char *buf, int size)
dp--;
*dp++ = '\n';
*dp = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
} else
HiSax_putstatus(cs, "LogFrame: ", "warning Frame too big (%d)", size);
}
@ -1246,7 +1246,7 @@ dlogframe(struct IsdnCardState *cs, struct sk_buff *skb, int dir)
}
if (finish) {
*dp = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
return;
}
if ((0xfe & buf[0]) == PROTO_DIS_N0) { /* 1TR6 */
@ -1509,5 +1509,5 @@ dlogframe(struct IsdnCardState *cs, struct sk_buff *skb, int dir)
dp += sprintf(dp, "Unknown protocol %x!", buf[0]);
}
*dp = 0;
HiSax_putstatus(cs, NULL, "%s", cs->dlog);
HiSax_putstatus(cs, NULL, cs->dlog);
}