Commit eb3d5cc6 authored by Jesper Juhl's avatar Jesper Juhl Committed by Rusty Russell
Browse files

modpost: Stop grab_file() from leaking filedescriptors if fstat() fails 



In case the open() call succeeds but the subsequent fstat() call
fails, then we'll return without close()'ing the filedescriptor.

Signed-off-by: default avatarJesper Juhl <jj@chaosbits.net>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 61011677

scripts/mod/modpost.c

+6 −3
Original line number Diff line number Diff line
@@ -337,17 +337,20 @@ static void sym_update_crc(const char *name, struct module *mod, 
void *grab_file(const char *filename, unsigned long *size)

{

	struct stat st;

	void *map;

	void *map = MAP_FAILED;

	int fd;



	fd = open(filename, O_RDONLY);

	if (fd < 0 || fstat(fd, &st) != 0)

	if (fd < 0)

		return NULL;

	if (fstat(fd, &st))

		goto failed;



	*size = st.st_size;

	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);

	close(fd);



failed:

	close(fd);

	if (map == MAP_FAILED)

		return NULL;

	return map;