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fs/ntfs3: Fix an NULL dereference bug

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The issue here is when this is called from ntfs_load_attr_list().  The
"size" comes from le32_to_cpu(attr->res.data_size) so it can't overflow
on a 64bit systems but on 32bit systems the "+ 1023" can overflow and
the result is zero.  This means that the kmalloc will succeed by
returning the ZERO_SIZE_PTR and then the memcpy() will crash with an
Oops on the next line.

Fixes: be71b5cba2 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Dan Carpenter 2023-10-17 17:04:39 +03:00 committed by Konstantin Komarov
parent d68968440b
commit b2dd7b953c
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1 changed files with 1 additions and 1 deletions
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fs/ntfs3/ntfs_fs.h
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@ -475,7 +475,7 @@ bool al_delete_le(struct ntfs_inode *ni, enum ATTR_TYPE type, CLST vcn,
int al_update(struct ntfs_inode *ni, int sync);
static inline size_t al_aligned(size_t size)
{
return (size + 1023) & ~(size_t)1023;
return size_add(size, 1023) & ~(size_t)1023;
}
/* Globals from bitfunc.c */