diff options
| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-10-19 23:28:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-20 10:26:36 -0700 |
| commit | d9d645f06a8f50659bbae2be64ed8367ba068fc0 (patch) | |
| tree | a514ffe62493538e0e5725685380b961e6ca4483 /arch/um | |
| parent | b2670eacfb013169b8bf151a5078a9ef8ef86466 (diff) | |
[PATCH] uml: cleanup run_helper() API to fix a leak
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>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/drivers/xterm.c | 2 | ||||
| -rw-r--r-- | arch/um/os-Linux/helper.c | 7 |
2 files changed, 3 insertions, 6 deletions
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c index 386f8b95298..850221d9b4c 100644 --- a/arch/um/drivers/xterm.c +++ b/arch/um/drivers/xterm.c @@ -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 { diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c index 8a78bf03b46..d13299cfa31 100644 --- a/arch/um/os-Linux/helper.c +++ b/arch/um/os-Linux/helper.c @@ -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 @@ out_close: 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; } |