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Date: Wed, 3 Dec 2014 19:24:07 -0500 From: Sasha Levin <sasha.levin@...cle.com> To: linux-kernel@...r.kernel.org Cc: Sasha Levin <sasha.levin@...cle.com>, Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org Subject: [PATCH] mm: shmem: avoid overflowing in shmem_fallocate "offset + len" has the potential of overflowing. Validate this user input first to avoid undefined behaviour. Signed-off-by: Sasha Levin <sasha.levin@...cle.com> --- mm/shmem.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/shmem.c b/mm/shmem.c index 185836b..5a0e344 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2098,6 +2098,9 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset, } /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ + error = -EOVERFLOW; + if ((u64)len + offset < (u64)len) + goto out; error = inode_newsize_ok(inode, offset + len); if (error) goto out; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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