diff options
| author | GeLiXin <[email protected]> | 2016-11-01 07:04:01 +0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2016-10-31 16:04:01 -0700 |
| commit | 4aafab91c5033e35217209d121f4c2fb83a8f690 (patch) | |
| tree | 62dc43157ba781e45dcf960ada03a8d81f716d70 /module | |
| parent | 9f38f81ca38e62bc31af1d4086e0f7a963644d38 (diff) | |
Fix coverity defects: CID 147509
CID 147509: Explicit null dereferenced
- l2arc_sublist_lock is fragile as relied on caller too much.
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: GeLiXin <[email protected]>
Closes #5319
Diffstat (limited to 'module')
| -rw-r--r-- | module/zfs/arc.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/module/zfs/arc.c b/module/zfs/arc.c index 0c5e66cbe..5825d3300 100644 --- a/module/zfs/arc.c +++ b/module/zfs/arc.c @@ -919,6 +919,12 @@ uint64_t zfs_crc64_table[256]; #define L2ARC_FEED_SECS 1 /* caching interval secs */ #define L2ARC_FEED_MIN_MS 200 /* min caching interval ms */ +/* + * We can feed L2ARC from two states of ARC buffers, mru and mfu, + * and each of the state has two types: data and metadata. + */ +#define L2ARC_FEED_TYPES 4 + #define l2arc_writes_sent ARCSTAT(arcstat_l2_writes_sent) #define l2arc_writes_done ARCSTAT(arcstat_l2_writes_done) @@ -6965,7 +6971,7 @@ l2arc_sublist_lock(int list_num) multilist_t *ml = NULL; unsigned int idx; - ASSERT(list_num >= 0 && list_num <= 3); + ASSERT(list_num >= 0 && list_num < L2ARC_FEED_TYPES); switch (list_num) { case 0: @@ -6980,6 +6986,8 @@ l2arc_sublist_lock(int list_num) case 3: ml = &arc_mru->arcs_list[ARC_BUFC_DATA]; break; + default: + return (NULL); } /* @@ -7138,10 +7146,12 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz) /* * Copy buffers for L2ARC writing. */ - for (try = 0; try <= 3; try++) { + for (try = 0; try < L2ARC_FEED_TYPES; try++) { multilist_sublist_t *mls = l2arc_sublist_lock(try); uint64_t passed_sz = 0; + VERIFY3P(mls, !=, NULL); + /* * L2ARC fast warmup. * |