libceph: fix overflow in __decode_pool_names()

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`len' is read from network and thus needs validation.  Otherwise a
large `len' would cause out-of-bounds access via the memcpy() call.
In addition, len = 0xffffffff would overflow the kmalloc() size,
leading to out-of-bounds write.

This patch adds a check of `len' via ceph_decode_need().  Also use
kstrndup rather than kmalloc/memcpy.

[elder@inktank.com: added -ENOMEM return for null kstrndup() result]

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Alex Elder <elder@inktank.com>

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Xi Wang 2012-06-06 19:35:55 -05:00 • committed by Alex Elder

parent 43643528cc

commit ad3b904c07

1 changed files with 7 additions and 6 deletions

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net/ceph/osdmap.c

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