From eb3d5cc67a525df5115c1dc1c0ff8a111bda70e4 Mon Sep 17 00:00:00 2001 From: Jesper Juhl Date: Wed, 23 May 2012 22:28:49 +0930 Subject: 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: Jesper Juhl Signed-off-by: Rusty Russell --- scripts/mod/modpost.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'scripts') diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index c4e7d1510f9..ea0eaca597b 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -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; -- cgit v1.2.3