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(parent: 11f62ba) | patch
net: ipmr: limit MRT_TABLE identifiers
authorEric Dumazet <edumazet@google.com>
Sun, 25 Nov 2012 09:44:29 +0000 (09:44 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 26 Nov 2012 22:36:59 +0000 (17:36 -0500)
commit22c58707a2bd018bbe9f036704b48f6a84a57974
treedf232ca487f9abb44f5be051addfe7bc8d96f484tree | snapshot
parent11f62ba7577ba95467b01b021a350837c59d2940commit | diff
net: ipmr: limit MRT_TABLE identifiers

Name of pimreg devices are built from following format :

char name[IFNAMSIZ]; // IFNAMSIZ == 16

sprintf(name, "pimreg%u", mrt->id);

We must therefore limit mrt->id to 9 decimal digits
or risk a buffer overflow and a crash.

Restrict table identifiers in [0 ... 999999999] interval.

Reported-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ipmr.c diff | blob | history
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