seq_file: disallow extremely large seq buffer allocations
commit8cae8cd89f
upstream. There is no reasonable need for a buffer larger than this, and it avoids int overflow pitfalls. Fixes:058504edd0
("fs/seq_file: fallback to vmalloc allocation") Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Reported-by: Qualys Security Advisory <qsa@qualys.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
c021be62bb
commit
6de9f0bf7c
|
@ -29,6 +29,9 @@ static void seq_set_overflow(struct seq_file *m)
|
|||
|
||||
static void *seq_buf_alloc(unsigned long size)
|
||||
{
|
||||
if (unlikely(size > MAX_RW_COUNT))
|
||||
return NULL;
|
||||
|
||||
return kvmalloc(size, GFP_KERNEL_ACCOUNT);
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue