linux-ext4 - [patch 2/4] ext4: fix error processing in mb_free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <200807130626.m6D6QKtc007910@imap1.linux-foundation.org>
Date:	Sat, 12 Jul 2008 23:26:20 -0700
From:	akpm@...ux-foundation.org
To:	tytso@....edu
Cc:	cmm@...ibm.com, linux-ext4@...r.kernel.org,
	akpm@...ux-foundation.org, shen@...fujitsu.com
Subject: [patch 2/4] ext4: fix error processing in mb_free_blocks

From: Shen Feng <shen@...fujitsu.com>

The error processing of the return value of mb_free_blocks is meanless
because it only returns 0.  This fix includes

- make mb_free_blocks return void

- remove the error processing part in callers

- unlock group before calling ext4_error in mb_free_blocks

Signed-off-by: Shen Feng <shen@...fujitsu.com>
Cc: Mingming Cao <cmm@...ibm.com>
Cc: Theodore Ts'o <tytso@....edu>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/ext4/mballoc.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff -puN fs/ext4/mballoc.c~ext4-fix-error-processing-in-mb_free_blocks fs/ext4/mballoc.c
--- a/fs/ext4/mballoc.c~ext4-fix-error-processing-in-mb_free_blocks
+++ a/fs/ext4/mballoc.c
@@ -1051,7 +1051,7 @@ static void mb_set_bits(spinlock_t *lock
 	}
 }
 
-static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
+static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
 			  int first, int count)
 {
 	int block = 0;
@@ -1091,11 +1091,12 @@ static int mb_free_blocks(struct inode *
 			blocknr += block;
 			blocknr +=
 			    le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-
+			ext4_unlock_group(sb, e4b->bd_group);
 			ext4_error(sb, __func__, "double-free of inode"
 				   " %lu's block %llu(bit %u in group %lu)\n",
 				   inode ? inode->i_ino : 0, blocknr, block,
 				   e4b->bd_group);
+			ext4_lock_group(sb, e4b->bd_group);
 		}
 		mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
 		e4b->bd_info->bb_counters[order]++;
@@ -1133,8 +1134,6 @@ static int mb_free_blocks(struct inode *
 		} while (1);
 	}
 	mb_check_buddy(e4b);
-
-	return 0;
 }
 
 static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
@@ -2694,8 +2693,7 @@ ext4_mb_free_committed_blocks(struct sup
 		ext4_lock_group(sb, md->group);
 		for (i = 0; i < md->num; i++) {
 			mb_debug(" %u", md->blocks[i]);
-			err = mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
-			BUG_ON(err != 0);
+			mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
 		}
 		mb_debug("\n");
 		ext4_unlock_group(sb, md->group);
@@ -4488,10 +4486,9 @@ do_more:
 		ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
 	} else {
 		ext4_lock_group(sb, block_group);
-		err = mb_free_blocks(inode, &e4b, bit, count);
+		mb_free_blocks(inode, &e4b, bit, count);
 		ext4_mb_return_to_preallocation(inode, &e4b, block, count);
 		ext4_unlock_group(sb, block_group);
-		BUG_ON(err != 0);
 	}
 
 	spin_lock(sb_bgl_lock(sbi, block_group));
_
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html