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mm, elf: handle vm_brk error 

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.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2016-05-23 16:25:39 -07:00 committed by Linus Torvalds
parent 864778b154
commit ecc2bc8ac0
1 changed files with 5 additions and 2 deletions
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7
fs/binfmt_elf.c
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@ -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: