malloc reference pointer free exception

[fmadelino]

Hello,

I hope that some one can explain the following behavior.

......

char *lpDummy = NULL;

TheFunction(&lpDummy);

if (lpDummy) free(lpDummy);

......

In the body of TheFunction memory is allocated for
the pointer lpDummy.

When i try to free it raises an error in debug mode
(Visual C++). The message is "DAMAGE: after Normal block ....."

TIA

Filipe Madelino

 

[Ben Pfaff]

I hope that some one can explain the following behavior.

.....

char *lpDummy = NULL;

TheFunction(&lpDummy);

if (lpDummy) free(lpDummy);

.....

In the body of TheFunction memory is allocated for
the pointer lpDummy.

You should probably show us how memory is allocated in
TheFunction. Most newbies screw this up the first few times.

 

[Dan Pop]

You should probably show us how memory is allocated in
TheFunction. Most newbies screw this up the first few times.

The actual message seems to suggest a buffer overrun.

Dan