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ext4: fix potential NULL dereference while tracing

Browse source 
The allocation_context pointer can be NULL.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2010-07-27 11:56:04 -04:00
commit e5880d76ae
2 changed files with 14 additions and 10 deletions
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20
include/trace/events/ext4.h
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@ -395,11 +395,12 @@ DEFINE_EVENT(ext4__mb_new_pa, ext4_mb_new_group_pa,
);
TRACE_EVENT(ext4_mb_release_inode_pa,
TP_PROTO(struct ext4_allocation_context *ac,
TP_PROTO(struct super_block *sb,
struct ext4_allocation_context *ac,
struct ext4_prealloc_space *pa,
unsigned long long block, unsigned int count),
TP_ARGS(ac, pa, block, count),
TP_ARGS(sb, ac, pa, block, count),
TP_STRUCT__entry(
__field( dev_t, dev )
@ -410,8 +411,9 @@ TRACE_EVENT(ext4_mb_release_inode_pa,
),
TP_fast_assign(
__entry->dev = ac->ac_sb->s_dev;
__entry->ino = ac->ac_inode->i_ino;
__entry->dev = sb->s_dev;
__entry->ino = (ac && ac->ac_inode) ?
ac->ac_inode->i_ino : 0;
__entry->block = block;
__entry->count = count;
),
@ -422,10 +424,11 @@ TRACE_EVENT(ext4_mb_release_inode_pa,
);
TRACE_EVENT(ext4_mb_release_group_pa,
TP_PROTO(struct ext4_allocation_context *ac,
TP_PROTO(struct super_block *sb,
struct ext4_allocation_context *ac,
struct ext4_prealloc_space *pa),
TP_ARGS(ac, pa),
TP_ARGS(sb, ac, pa),
TP_STRUCT__entry(
__field( dev_t, dev )
@ -436,8 +439,9 @@ TRACE_EVENT(ext4_mb_release_group_pa,
),
TP_fast_assign(
__entry->dev = ac->ac_sb->s_dev;
__entry->ino = ac->ac_inode->i_ino;
__entry->dev = sb->s_dev;
__entry->ino = (ac && ac->ac_inode) ?
ac->ac_inode->i_ino : 0;
__entry->pa_pstart = pa->pa_pstart;
__entry->pa_len = pa->pa_len;
),