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bluez.14902
0008-btmon-fix-segfault-caused-by-integer-undef...
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File 0008-btmon-fix-segfault-caused-by-integer-undeflow.patch of Package bluez.14902
From 1206eee71cd475882f0af9c4ec7990ae4822ddfe Mon Sep 17 00:00:00 2001 From: Matias Karhumaa <matias.karhumaa@gmail.com> Date: Tue, 16 Oct 2018 23:23:12 +0300 Subject: [PATCH 08/13] btmon: fix segfault caused by integer undeflow Fix segfault caused by integer underflow. Fix is to check that rsp->num_codecs + 3 is not bigger than size before subtracting. Crash was found by fuzzing btmon with AFL. --- monitor/packet.c | 5 +++++ 1 file changed, 5 insertions(+) Index: bluez-5.48/monitor/packet.c =================================================================== --- bluez-5.48.orig/monitor/packet.c +++ bluez-5.48/monitor/packet.c @@ -5897,6 +5897,11 @@ static void read_local_codecs_rsp(const const struct bt_hci_rsp_read_local_codecs *rsp = data; uint8_t i, num_vnd_codecs; + if (rsp->num_codecs + 3 > size) { + print_field("Invalid number of codecs."); + return; + } + print_status(rsp->status); print_field("Number of supported codecs: %d", rsp->num_codecs);
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