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authorOleg Nesterov <oleg@redhat.com>2013-09-11 14:24:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:59:09 -0700
commit6b3c538f5b2cfc53cb6803ec5001bbcf8f18a98e (patch)
tree5a3dd78b655c93d7248facb2377be2630435b1fc /fs/exec.c
parent4e0621a07ea58a0dc15859be3b743bdeb194a51b (diff)
downloadlinux-6b3c538f5b2cfc53cb6803ec5001bbcf8f18a98e.tar.gz
exec: cleanup the error handling in search_binary_handler()
The error hanling and ret-from-loop look confusing and inconsistent. - "retval >= 0" simply returns - "!bprm->file" returns too but with read_unlock() because binfmt_lock was already re-acquired - "retval != -ENOEXEC || bprm->mm == NULL" does "break" and relies on the same check after the main loop Consolidate these checks into a single if/return statement. need_retry still checks "retval == -ENOEXEC", but this and -ENOENT before the main loop are not needed. This is only for pathological and impossible list_empty(&formats) case. It is not clear why do we check "bprm->mm == NULL", probably this should be removed. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Evgeniy Polyakov <zbr@ioremap.net> Cc: Zach Levis <zml@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 635b586de33..8875dd10ae7 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1399,22 +1399,17 @@ int search_binary_handler(struct linux_binprm *bprm)
bprm->recursion_depth++;
retval = fmt->load_binary(bprm);
bprm->recursion_depth--;
- if (retval >= 0) {
+ if (retval >= 0 || retval != -ENOEXEC ||
+ bprm->mm == NULL || bprm->file == NULL) {
put_binfmt(fmt);
return retval;
}
read_lock(&binfmt_lock);
put_binfmt(fmt);
- if (retval != -ENOEXEC || bprm->mm == NULL)
- break;
- if (!bprm->file) {
- read_unlock(&binfmt_lock);
- return retval;
- }
}
read_unlock(&binfmt_lock);
- if (need_retry && retval == -ENOEXEC && bprm->mm) {
+ if (need_retry && retval == -ENOEXEC) {
if (printable(bprm->buf[0]) && printable(bprm->buf[1]) &&
printable(bprm->buf[2]) && printable(bprm->buf[3]))
return retval;