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Bug#35616: memory overrun on 64-bit linux on setting large values for keybuffer-size

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We could allocate chunks larger than 4GB, but did our
size-accounting in 32-bit values. This could lead to
spurious warnings, inaccurate accounting, and, in
theory, data loss.
  
Affected: 64-bit platforms. Debug-build (with safemalloc).
At least one buffer larger than 4GB. For potential data
loss, a re-alloc on such a buffer would be necessary.
This commit is contained in:
Tatiana A. Nurnberg 2008-08-19 15:56:41 +02:00
parent 0cf71401b3
commit 9c24a39a42
2 changed files with 3 additions and 3 deletions
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4
mysys/my_static.c
View File

@ -70,8 +70,8 @@ uint sf_malloc_prehunc=0, /* If you have problem with core- */
sf_malloc_endhunc=0, /* dump when malloc-message.... */ sf_malloc_endhunc=0, /* dump when malloc-message.... */
/* set theese to 64 or 128 */ /* set theese to 64 or 128 */
sf_malloc_quick=0; /* set if no calls to sanity */ sf_malloc_quick=0; /* set if no calls to sanity */
ulong sf_malloc_cur_memory= 0L; /* Current memory usage */ size_t sf_malloc_cur_memory= 0L; /* Current memory usage */
ulong sf_malloc_max_memory= 0L; /* Maximum memory usage */ size_t sf_malloc_max_memory= 0L; /* Maximum memory usage */
uint sf_malloc_count= 0; /* Number of times NEW() was called */ uint sf_malloc_count= 0; /* Number of times NEW() was called */
uchar *sf_min_adress= (uchar*) ~(unsigned long) 0L, uchar *sf_min_adress= (uchar*) ~(unsigned long) 0L,
*sf_max_adress= (uchar*) 0L; *sf_max_adress= (uchar*) 0L;

2
mysys/my_static.h
View File

@ -44,8 +44,8 @@ struct st_irem
struct st_irem *next; /* Linked list of structures */ struct st_irem *next; /* Linked list of structures */
struct st_irem *prev; /* Other link */ struct st_irem *prev; /* Other link */
char *filename; /* File in which memory was new'ed */ char *filename; /* File in which memory was new'ed */
size_t datasize; /* Size requested */
uint32 linenum; /* Line number in above file */ uint32 linenum; /* Line number in above file */
uint32 datasize; /* Size requested */
uint32 SpecialValue; /* Underrun marker value */ uint32 SpecialValue; /* Underrun marker value */
}; };