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ocfs2: ocfs2_fs.h: replace zero-length array with flexible-array member 

The current codebase makes use of the zero-length array language extension
to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning in
case the flexible array does not occur last in the structure, which will
help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by this
change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied.  As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://urldefense.com/v3/__https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html__;!!GqivPVa7Brio!OKPotRhYhHbCG2kibo8Q6_6CuKaa28d_74h1svxyR6rbshrK2L_BdrQpNbvJWBWb40QCkg$
[2] https://urldefense.com/v3/__https://github.com/KSPP/linux/issues/21__;!!GqivPVa7Brio!OKPotRhYhHbCG2kibo8Q6_6CuKaa28d_74h1svxyR6rbshrK2L_BdrQpNbvJWBUhNn9M6g$
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Link: http://lkml.kernel.org/r/20200309202155.GA8432@embeddedor
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gustavo A. R. Silva 2020-04-01 21:03:58 -07:00 committed by Linus Torvalds
parent 8cb92435e2
commit 95f3427c24
1 changed files with 9 additions and 9 deletions
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18
fs/ocfs2/ocfs2_fs.h
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@ -470,7 +470,7 @@ struct ocfs2_extent_list {
__le16 l_reserved1;
__le64 l_reserved2; /* Pad to
sizeof(ocfs2_extent_rec) */
/*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
/*10*/ struct ocfs2_extent_rec l_recs[]; /* Extent records */
};
/*
@ -484,7 +484,7 @@ struct ocfs2_chain_list {
__le16 cl_count; /* Total chains in this list */
__le16 cl_next_free_rec; /* Next unused chain slot */
__le64 cl_reserved1;
/*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
/*10*/ struct ocfs2_chain_rec cl_recs[]; /* Chain records */
};
/*
@ -496,7 +496,7 @@ struct ocfs2_truncate_log {
/*00*/ __le16 tl_count; /* Total records in this log */
__le16 tl_used; /* Number of records in use */
__le32 tl_reserved1;
/*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
/*08*/ struct ocfs2_truncate_rec tl_recs[]; /* Truncate records */
};
/*
@ -640,7 +640,7 @@ struct ocfs2_local_alloc
__le16 la_size; /* Size of included bitmap, in bytes */
__le16 la_reserved1;
__le64 la_reserved2;
/*10*/ __u8 la_bitmap[0];
/*10*/ __u8 la_bitmap[];
};
/*
@ -653,7 +653,7 @@ struct ocfs2_inline_data
* for data, starting at id_data */
__le16 id_reserved0;
__le32 id_reserved1;
__u8 id_data[0]; /* Start of user data */
__u8 id_data[]; /* Start of user data */
};
/*
@ -798,7 +798,7 @@ struct ocfs2_dx_entry_list {
* possible in de_entries */
__le16 de_num_used; /* Current number of
* de_entries entries */
struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries
struct ocfs2_dx_entry de_entries[]; /* Indexed dir entries
* in a packed array of
* length de_num_used */
};
@ -935,7 +935,7 @@ struct ocfs2_refcount_list {
__le16 rl_used; /* Current number of used records */
__le32 rl_reserved2;
__le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
/*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
/*10*/ struct ocfs2_refcount_rec rl_recs[]; /* Refcount records */
};
@ -1021,7 +1021,7 @@ struct ocfs2_xattr_header {
buckets. A block uses
xb_check and sets
this field to zero.) */
struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
struct ocfs2_xattr_entry xh_entries[]; /* xattr entry list. */
};
/*
@ -1207,7 +1207,7 @@ struct ocfs2_local_disk_dqinfo {
/* Header of one chunk of a quota file */
struct ocfs2_local_disk_chunk {
__le32 dqc_free; /* Number of free entries in the bitmap */
__u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding
__u8 dqc_bitmap[]; /* Bitmap of entries in the corresponding
* chunk of quota file */
};