PWN-Hunter/android_kernel_xiaomi_sdm845
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is_power_of_2 in fat

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Replacing (n & (n-1)) in the context of power of 2 checks with
is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vignesh Babu BM 2007-05-08 00:24:27 -07:00 committed by Linus Torvalds
parent 4fa156ea84
commit e7d709c096
1 changed files with 3 additions and 4 deletions
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7
fs/fat/inode.c
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@ -25,6 +25,7 @@
#include <linux/parser.h> #include <linux/parser.h>
#include <linux/uio.h> #include <linux/uio.h>
#include <linux/writeback.h> #include <linux/writeback.h>
#include <linux/log2.h>
#include <asm/unaligned.h> #include <asm/unaligned.h>
#ifndef CONFIG_FAT_DEFAULT_IOCHARSET #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@ -1217,8 +1218,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
} }
logical_sector_size = logical_sector_size =
le16_to_cpu(get_unaligned((__le16 *)&b->sector_size)); le16_to_cpu(get_unaligned((__le16 *)&b->sector_size));
if (!logical_sector_size if (!is_power_of_2(logical_sector_size)
|| (logical_sector_size & (logical_sector_size - 1))
|| (logical_sector_size < 512) || (logical_sector_size < 512)
|| (PAGE_CACHE_SIZE < logical_sector_size)) { || (PAGE_CACHE_SIZE < logical_sector_size)) {
if (!silent) if (!silent)
@ -1228,8 +1228,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
goto out_invalid; goto out_invalid;
} }
sbi->sec_per_clus = b->sec_per_clus; sbi->sec_per_clus = b->sec_per_clus;
if (!sbi->sec_per_clus if (!is_power_of_2(sbi->sec_per_clus)) {
|| (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) {
if (!silent) if (!silent)
printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", printk(KERN_ERR "FAT: bogus sectors per cluster %u\n",
sbi->sec_per_clus); sbi->sec_per_clus);