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Bug# 19573096: LOADING CORRUPTED GEOMETRY DATA INTO A

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MYISAM TABLE CAUSES THE SERVER TO CRASH

Issue:
-----
During index maintanence, R-tree node might need a split.
In some cases the square of mbr could be calculated to
infinite (as in this case) or to NaN. This is currently
not handled. This is specific to MyISAM.

SOLUTION:
---------
If the calculated value in "mbr_join_square" is infinite or
NaN, set it to max double value.

Initialization of output parameters of "pick_seeds" is
required if calculation is infinite (or negative infinite).

Similar to the fix made for INNODB as part of Bug#19533996.
This commit is contained in:
Sreeharsha Ramanavarapu 2015-03-23 08:49:26 +05:30
parent 120907c0a2
commit b7bdea944d
1 changed files with 7 additions and 0 deletions
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7
storage/myisam/rt_split.c
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@ -68,6 +68,10 @@ static double mbr_join_square(const double *a, const double *b, int n_dim)
b += 2;
}while (a != end);
/* Check for infinity or NaN */
if (my_isinf(square) || isnan(square))
square = DBL_MAX;
return square;
}
@ -102,6 +106,9 @@ static void pick_seeds(SplitStruct *node, int n_entries,
double max_d = -DBL_MAX;
double d;
*seed_a = node;
*seed_b = node + 1;
for (cur1 = node; cur1 < lim1; ++cur1)
{
for (cur2=cur1 + 1; cur2 < lim2; ++cur2)