From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org, Jan Kara <jack@suse.com>
Cc: "Arnd Bergmann" <arnd@arndb.de>, "Pali Rohár" <pali@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Steven J. Magnani" <steve@digidescorp.com>,
"Al Viro" <viro@zeniv.linux.org.uk>
Subject: [PATCH 09/15] udf: avoid gcc-10 zero-length-bounds warnings
Date: Thu, 30 Apr 2020 23:30:51 +0200 [thread overview]
Message-ID: <20200430213101.135134-10-arnd@arndb.de> (raw)
In-Reply-To: <20200430213101.135134-1-arnd@arndb.de>
gcc-10 warns about writes to the empty freeSpaceTable[] array, with
many instances like:
fs/udf/balloc.c: In function 'udf_bitmap_new_block':
fs/udf/balloc.c:101:36: error: array subscript 65535 is outside the bounds of an interior zero-length array '__le32[0]' {aka 'unsigned int[0]'} [-Werror=zero-length-bounds]
101 | le32_add_cpu(&lvid->freeSpaceTable[partition], cnt);
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
In file included from fs/udf/udfdecl.h:7,
from fs/udf/balloc.c:22:
fs/udf/ecma_167.h:363:11: note: while referencing 'freeSpaceTable'
363 | __le32 freeSpaceTable[0];
| ^~~~~~~~~~~~~~
These can all be avoided by using a flexible array member instead.
Another warning is a bit more obscure:
fs/udf/super.c: In function 'udf_count_free':
fs/udf/super.c:2521:26: warning: array subscript '(<unknown>) + 4294967295' is outside the bounds of an interior zero-length array '__le32[0]' {aka 'unsigned int[0]'} [-Wzero-length-bounds]
2521 | lvid->freeSpaceTable[part]);
Work around this one by changing the array access to equivalent
pointer arithmetic, as there cannot be multiple flexible-array
members in a single struct.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
fs/udf/ecma_167.h | 2 +-
fs/udf/super.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/udf/ecma_167.h b/fs/udf/ecma_167.h
index 736ebc5dc441..14ffe27342bc 100644
--- a/fs/udf/ecma_167.h
+++ b/fs/udf/ecma_167.h
@@ -360,9 +360,9 @@ struct logicalVolIntegrityDesc {
uint8_t logicalVolContentsUse[32];
__le32 numOfPartitions;
__le32 lengthOfImpUse;
- __le32 freeSpaceTable[0];
__le32 sizeTable[0];
uint8_t impUse[0];
+ __le32 freeSpaceTable[];
} __packed;
/* Integrity Type (ECMA 167r3 3/10.10.3) */
diff --git a/fs/udf/super.c b/fs/udf/super.c
index f747bf72edbe..379867888c36 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -117,7 +117,7 @@ struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
}
/* The offset is to skip freeSpaceTable and sizeTable arrays */
offset = partnum * 2 * sizeof(uint32_t);
- return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
+ return (struct logicalVolIntegrityDescImpUse *)(lvid->impUse + offset);
}
/* UDF filesystem type */
--
2.26.0
next prev parent reply other threads:[~2020-04-30 21:32 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 21:30 [PATCH 00/15] gcc-10 warning fixes Arnd Bergmann
2020-04-30 21:30 ` [PATCH 01/15] crypto - Avoid free() namespace collision Arnd Bergmann
2020-05-08 6:06 ` Herbert Xu
2020-04-30 21:30 ` [PATCH 02/15] iwlwifi: mvm: fix gcc-10 zero-length-bounds warning Arnd Bergmann
2020-06-10 12:18 ` Luciano Coelho
2020-04-30 21:30 ` [PATCH 03/15] mwifiex: avoid -Wstringop-overflow warning Arnd Bergmann
2020-05-06 8:43 ` Kalle Valo
2020-04-30 21:30 ` [PATCH 04/15] ath10k: fix gcc-10 zero-length-bounds warnings Arnd Bergmann
2020-04-30 21:45 ` Gustavo A. R. Silva
2020-04-30 21:44 ` Arnd Bergmann
2020-05-04 11:54 ` Kalle Valo
2020-05-04 16:09 ` Gustavo A. R. Silva
2020-05-05 4:56 ` Kalle Valo
2020-04-30 21:30 ` [PATCH 05/15] bpf: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-04 21:06 ` Daniel Borkmann
2020-04-30 21:30 ` [PATCH 06/15] netfilter: conntrack: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-10 21:48 ` Pablo Neira Ayuso
2020-04-30 21:30 ` [PATCH 07/15] drop_monitor: work around gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-01 11:28 ` Neil Horman
2020-04-30 21:30 ` [PATCH 08/15] usb: ehci: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-01 2:42 ` Alan Stern
2020-05-01 20:06 ` Arnd Bergmann
2020-05-01 20:10 ` Alan Stern
2020-04-30 21:30 ` Arnd Bergmann [this message]
2020-04-30 21:54 ` [PATCH 09/15] udf: avoid gcc-10 zero-length-bounds warnings Pali Rohár
2020-05-01 20:30 ` Arnd Bergmann
2020-05-01 20:48 ` Jan Kara
2020-05-01 20:57 ` Pali Rohár
2020-04-30 21:30 ` [PATCH 10/15] hpfs: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 11/15] omfs: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 12/15] media: s5k5baf: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:46 ` Gustavo A. R. Silva
2020-04-30 21:30 ` [PATCH 13/15] scsi: sas: " Arnd Bergmann
2020-05-01 7:47 ` John Garry
2020-05-01 7:54 ` Arnd Bergmann
2020-05-01 14:53 ` James Bottomley
2020-05-01 17:36 ` Arnd Bergmann
2020-04-30 21:30 ` [PATCH 14/15] isci: " Arnd Bergmann
2020-04-30 21:30 ` [PATCH 15/15] nvme: " Arnd Bergmann
2020-05-01 7:32 ` Christoph Hellwig
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