diff options
Diffstat (limited to 'innobase/row/row0sel.c')
| -rw-r--r-- | innobase/row/row0sel.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/innobase/row/row0sel.c b/innobase/row/row0sel.c index a3744089258..ea5b3020c08 100644 --- a/innobase/row/row0sel.c +++ b/innobase/row/row0sel.c @@ -2415,6 +2415,7 @@ row_sel_push_cache_row_for_mysql( row_prebuilt_t* prebuilt, /* in: prebuilt struct */ rec_t* rec) /* in: record to push */ { + byte* buf; ulint i; ut_ad(prebuilt->n_fetch_cached < MYSQL_FETCH_CACHE_SIZE); @@ -2424,8 +2425,18 @@ row_sel_push_cache_row_for_mysql( /* Allocate memory for the fetch cache */ for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) { - prebuilt->fetch_cache[i] = mem_alloc( - prebuilt->mysql_row_len); + + /* A user has reported memory corruption in these + buffers in Linux. Put magic numbers there to help + to track a possible bug. */ + + buf = mem_alloc(prebuilt->mysql_row_len + 8); + + prebuilt->fetch_cache[i] = buf + 4; + + mach_write_to_4(buf, ROW_PREBUILT_FETCH_MAGIC_N); + mach_write_to_4(buf + 4 + prebuilt->mysql_row_len, + ROW_PREBUILT_FETCH_MAGIC_N); } } @@ -2437,7 +2448,7 @@ row_sel_push_cache_row_for_mysql( prebuilt->n_fetch_cached++; } - + /************************************************************************* Tries to do a shortcut to fetch a clustered index record with a unique key, using the hash index if possible (not always). We assume that the search |