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[PATCH] uml: cleanup run_helper() API to fix a leak

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Freeing the stack is left uselessly to the caller of run_helper in some cases
- this is taken from run_helper_thread, but here it is useless, so no caller
needs it and the only place where this happens has a potential leak - in case
of error neither run_helper() nor xterm_open() call free_stack().  At this
point passing a pointer is not needed - the stack pointer should be passed
directly, but this change is not done here.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2006-10-19 23:28:24 -07:00 committed by Linus Torvalds
parent b2670eacfb
commit d9d645f06a
2 changed files with 3 additions and 6 deletions
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2
arch/um/drivers/xterm.c
View file

@ -136,8 +136,6 @@ int xterm_open(int input, int output, int primary, void *d,
return(pid);
}
if(data->stack == 0) free_stack(stack, 0);
if (data->direct_rcv) {
new = os_rcv_fd(fd, &data->helper_pid);
} else {

7
arch/um/os-Linux/helper.c
View file

@ -50,7 +50,8 @@ static int helper_child(void *arg)
}
/* Returns either the pid of the child process we run or -E* on failure.
* XXX The alloc_stack here breaks if this is called in the tracing thread */
* XXX The alloc_stack here breaks if this is called in the tracing thread, so
* we need to receive a preallocated stack (a local buffer is ok). */
int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
unsigned long *stack_out)
{
@ -113,10 +114,8 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
close(fds[1]);
close(fds[0]);
out_free:
if (stack_out == NULL)
if ((stack_out == NULL) || (*stack_out == 0))
free_stack(stack, 0);
else
*stack_out = stack;
return ret;
}