tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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fs/libfs.c: fix simple_attr_write() on 32bit machines

Assume that /sys/kernel/debug/dummy64 is debugfs file created by
debugfs_create_x64().

# cd /sys/kernel/debug
# echo 0x1234567812345678 > dummy64
# cat dummy64
0x0000000012345678

# echo 0x80000000 > dummy64
# cat dummy64
0xffffffff80000000

A value larger than INT_MAX cannot be written to the debugfs file created
by debugfs_create_u64 or debugfs_create_x64 on 32bit machine. Because
simple_attr_write() uses simple_strtol() for the conversion.

To fix this, use simple_strtoll() instead.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Akinobu Mita and committed by
Linus Torvalds f7b88631 e501f29c

+1 -1
+1 -1
fs/libfs.c
··· 822 822 goto out; 823 823 824 824 attr->set_buf[size] = '\0'; 825 - val = simple_strtol(attr->set_buf, NULL, 0); 825 + val = simple_strtoll(attr->set_buf, NULL, 0); 826 826 ret = attr->set(attr->data, val); 827 827 if (ret == 0) 828 828 ret = len; /* on success, claim we got the whole input */