From: Nickolai Zeldovich <nickolai@csail.mit.edu>
Date: Sat, 5 Jan 2013 19:19:21 +0000 (-0500)
Subject: jfs: avoid undefined behavior from left-shifting by 32 bits
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~49^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d48017bce890b19e3bba649850bdbc8a6f95903;p=pandora-kernel.git

jfs: avoid undefined behavior from left-shifting by 32 bits

Shifting a 32-bit int by 32 bits is undefined behavior in C, and
results in different behavior on different architectures (e.g., x86
and PowerPC).  diAlloc() in fs/jfs/jfs_imap.c computes a mask using
0xffffffffu<<(32-bitno), which can left-shift by 32 bits.  To avoid
unexpected behavior, explicitly check for bitno==0 and use a 0 mask.

Signed-off-by: Nickolai Zeldovich <nickolai@csail.mit.edu>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
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