[PATCH 05/18] mm, elf: handle vm_brk error

[Michal Hocko <mhocko@kernel.org>]

From: Michal Hocko <mhocko@suse.com>

load_elf_library doesn't handle vm_brk failure although nothing really
indicates it cannot do that because the function is allowed to fail
due to vm_mmap failures already. This might be not a problem now
but later patch will make vm_brk killable (resp. mmap_sem for write
waiting will become killable) and so the failure will be more probable.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 fs/binfmt_elf.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7d914c67a9d0..2e45ae57ea88 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1176,8 +1176,11 @@ static int load_elf_library(struct file *file)
 	len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
 			    ELF_MIN_ALIGN - 1);
 	bss = eppnt->p_memsz + eppnt->p_vaddr;
-	if (bss > len)
-		vm_brk(len, bss - len);
+	if (bss > len) {
+		error = vm_brk(len, bss - len);
+		if (BAD_ADDR(error))
+			goto out_free_ph;
+	}
 	error = 0;
 
 out_free_ph:
-- 
2.7.0

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