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| author | Nickolai Zeldovich <nickolai@csail.mit.edu> | 2013-01-05 23:19:21 +0400 |
|---|---|---|
| committer | Dave Kleikamp <dave.kleikamp@oracle.com> | 2013-01-07 18:21:36 +0400 |
| commit | 9d48017bce890b19e3bba649850bdbc8a6f95903 (patch) | |
| tree | ece6878230600e39daafc2169afaced628cac871 /fs/jfs/jfs_logmgr.c | |
| parent | 5f243b9b46a22e5790dbbc36f574c2417af49a41 (diff) | |
| download | linux-9d48017bce890b19e3bba649850bdbc8a6f95903.tar.xz | |
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>
Diffstat (limited to 'fs/jfs/jfs_logmgr.c')
0 files changed, 0 insertions, 0 deletions