ext4: fix potential NULL dereference while tracing
The allocation_context pointer can be NULL. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -3575,7 +3575,7 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
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trace_ext4_mballoc_discard(ac);
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}
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trace_ext4_mb_release_inode_pa(ac, pa, grp_blk_start + bit,
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trace_ext4_mb_release_inode_pa(sb, ac, pa, grp_blk_start + bit,
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next - bit);
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mb_free_blocks(pa->pa_inode, e4b, bit, next - bit);
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bit = next + 1;
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@ -3606,7 +3606,7 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
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ext4_group_t group;
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ext4_grpblk_t bit;
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trace_ext4_mb_release_group_pa(ac, pa);
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trace_ext4_mb_release_group_pa(sb, ac, pa);
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BUG_ON(pa->pa_deleted == 0);
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ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
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BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
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@ -395,11 +395,12 @@ DEFINE_EVENT(ext4__mb_new_pa, ext4_mb_new_group_pa,
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);
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TRACE_EVENT(ext4_mb_release_inode_pa,
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TP_PROTO(struct ext4_allocation_context *ac,
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TP_PROTO(struct super_block *sb,
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struct ext4_allocation_context *ac,
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struct ext4_prealloc_space *pa,
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unsigned long long block, unsigned int count),
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TP_ARGS(ac, pa, block, count),
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TP_ARGS(sb, ac, pa, block, count),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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@ -410,8 +411,9 @@ TRACE_EVENT(ext4_mb_release_inode_pa,
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),
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TP_fast_assign(
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__entry->dev = ac->ac_sb->s_dev;
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__entry->ino = ac->ac_inode->i_ino;
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__entry->dev = sb->s_dev;
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__entry->ino = (ac && ac->ac_inode) ?
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ac->ac_inode->i_ino : 0;
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__entry->block = block;
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__entry->count = count;
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),
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@ -422,10 +424,11 @@ TRACE_EVENT(ext4_mb_release_inode_pa,
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);
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TRACE_EVENT(ext4_mb_release_group_pa,
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TP_PROTO(struct ext4_allocation_context *ac,
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TP_PROTO(struct super_block *sb,
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struct ext4_allocation_context *ac,
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struct ext4_prealloc_space *pa),
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TP_ARGS(ac, pa),
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TP_ARGS(sb, ac, pa),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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@ -436,8 +439,9 @@ TRACE_EVENT(ext4_mb_release_group_pa,
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),
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TP_fast_assign(
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__entry->dev = ac->ac_sb->s_dev;
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__entry->ino = ac->ac_inode->i_ino;
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__entry->dev = sb->s_dev;
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__entry->ino = (ac && ac->ac_inode) ?
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ac->ac_inode->i_ino : 0;
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__entry->pa_pstart = pa->pa_pstart;
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__entry->pa_len = pa->pa_len;
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),
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