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43 lines
1.1 KiB
43 lines
1.1 KiB
5 years ago
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From 7ada13f3a40e2f58aea335cf910666378e7dd99a Mon Sep 17 00:00:00 2001
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From: Eugene Syromyatnikov <evgsyr@gmail.com>
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Date: Fri, 12 Jul 2019 14:38:33 +0200
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Subject: [PATCH 1/3] evdev: avoid bit vector decoding on non-successful and 0
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return codes
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Reported by Clang.
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strace/evdev.c:157:3: note: The value 0 is assigned to 'size'
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# size = tcp->u_rval * 8;
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# ^~~~~~~~~~~~~~~~~~~~~~
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strace/evdev.c:158:2: warning: Declared variable-length array (VLA)
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has zero size
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# char decoded_arg[size];
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# ^
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* evdev.c (decode_bitset_): Bail out before decoded_arg VLA definition.
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---
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evdev.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/evdev.c b/evdev.c
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index e402d26e..4b811cf8 100644
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--- a/evdev.c
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+++ b/evdev.c
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@@ -155,6 +155,13 @@ decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
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size = max_nr;
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else
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size = tcp->u_rval * 8;
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+
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+ if (syserror(tcp) || !size) {
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+ printaddr(arg);
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+
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+ return RVAL_IOCTL_DECODED;
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+ }
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+
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char decoded_arg[size];
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if (umove_or_printaddr(tcp, arg, &decoded_arg))
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--
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2.13.6
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