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Message-Id: <a92156a6bd79e5a3339b10fe3ae465785a918fbb.1413021630.git.tilman@imap.cc> Date: Sat, 11 Oct 2014 13:46:30 +0200 (CEST) From: Tilman Schmidt <tilman@...p.cc> To: netdev@...r.kernel.org Cc: David Miller <davem@...emloft.net>, Dave Jones <davej@...hat.com>, Hansjoerg Lipp <hjlipp@....de>, Karsten Keil <isdn@...ux-pingi.de>, isdn4linux@...tserv.isdn4linux.de Subject: [PATCH 07/12] isdn/capi: prevent index overrun from command_2_index() The result of the function command_2_index() is used to index two arrays mnames[] and cpars[] with max. index 0x4e but in its current form that function can produce results up to 3*(0x9+0x9)+0x7f = 0xb5. Fix by clamping all result values potentially overrunning the arrays to zero which is already handled as an invalid value. Re-spotted with Coverity. Signed-off-by: Tilman Schmidt <tilman@...p.cc> --- drivers/isdn/capi/capiutil.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c index 4073d16..b501d76 100644 --- a/drivers/isdn/capi/capiutil.c +++ b/drivers/isdn/capi/capiutil.c @@ -207,6 +207,8 @@ static unsigned command_2_index(unsigned c, unsigned sc) c = 0x9 + (c & 0x0f); else if (c == 0x41) c = 0x9 + 0x1; + if (c > 0x18) + c = 0x00; return (sc & 3) * (0x9 + 0x9) + c; } -- 1.9.2.459.g68773ac -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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