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| author | Prasad J Pandit <pjp@fedoraproject.org> | 2017-07-17 17:33:26 +0530 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2017-08-03 00:26:44 +0200 |
| commit | 413d463f43fbc4dd3a601e80a5724aa384a265a0 (patch) | |
| tree | 46d91274360ae4adcf4dd21ea30fd39e00ce7cf5 /slirp | |
| parent | 5c843af22604edecda10d4bb89d4eede9e1bd3d0 (diff) | |
| download | qemu-413d463f43fbc4dd3a601e80a5724aa384a265a0.zip qemu-413d463f43fbc4dd3a601e80a5724aa384a265a0.tar.gz qemu-413d463f43fbc4dd3a601e80a5724aa384a265a0.tar.bz2 | |
slirp: check len against dhcp options array end
While parsing dhcp options string in 'dhcp_decode', if an options'
length 'len' appeared towards the end of 'bp_vend' array, ensuing
read could lead to an OOB memory access issue. Add check to avoid it.
This is CVE-2017-11434.
Reported-by: Reno Robert <renorobert@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Diffstat (limited to 'slirp')
| -rw-r--r-- | slirp/bootp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/slirp/bootp.c b/slirp/bootp.c index 5a4646c..5dd1a41 100644 --- a/slirp/bootp.c +++ b/slirp/bootp.c @@ -123,6 +123,9 @@ static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type, if (p >= p_end) break; len = *p++; + if (p + len > p_end) { + break; + } DPRINTF("dhcp: tag=%d len=%d\n", tag, len); switch(tag) { |