android_kernel_xiaomi_sm8350/include/linux/coredump.h
André Goddard Rosa 6e3e37a5a7 coredump: plug a memory leak situation on dump_seek()
After having started writing the coredump, if filesystem reports an error
anytime while writing part of the core file, we would leak a memory page
when bailing out.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Roland McGrath <roland@redhat.com>
Cc: WANG Cong <amwang@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-12 15:52:32 -08:00

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C

#ifndef _LINUX_COREDUMP_H
#define _LINUX_COREDUMP_H
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/fs.h>
/*
* These are the only things you should do on a core-file: use only these
* functions to write out all the necessary info.
*/
static inline int dump_write(struct file *file, const void *addr, int nr)
{
return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
}
static inline int dump_seek(struct file *file, loff_t off)
{
int ret = 1;
if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
return 0;
} else {
char *buf = (char *)get_zeroed_page(GFP_KERNEL);
if (!buf)
return 0;
while (off > 0) {
unsigned long n = off;
if (n > PAGE_SIZE)
n = PAGE_SIZE;
if (!dump_write(file, buf, n)) {
ret = 0;
break;
}
off -= n;
}
free_page((unsigned long)buf);
}
return ret;
}
#endif /* _LINUX_COREDUMP_H */