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TITLE:
Linux Kernel "hfsplus_find_cat()" and "hfsplus_block_allocate()"
Denial of Service

SECUNIA ADVISORY ID:
SA32510

VERIFY ADVISORY:
http://secunia.com/advisories/32510/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/advisories/product/2719/

DESCRIPTION:
Some vulnerabilities have been reported in the Linux Kernel, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service).

1) A vulnerability is caused due to the "hfsplus_find_cat()" function
in fs/hfsplus/catalog.c not properly checking the catalog name length.
This can be exploited to crash a system by e.g. mounting a specially
crafted hfsplus file system.

2) A vulnerability is caused due to the "hfsplus_block_allocate()"
function in fs/hfsplus/bitmap.c not properly checking the return
values of "read_mapping_page()" function before using them. This can
be exploited to crash a system by e.g. mounting a specially crafted
hfsplus file system.

SOLUTION:
Fixed in version 2.6.28-rc1.

PROVIDED AND/OR DISCOVERED BY:
Eris Sesterhenn

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.28-rc1

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