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automount: check for recursive automount 

automount_mount calls run_command which may trigger an automount
again. This results in an endless loop. A simple way to trigger
this is:

mkdir /x; automount /x false; cd /x; something

Use a static variable to detect if we are currently in automount_mount()
and bail out if we are.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-07-03 08:16:39 +02:00
parent 477199c684
commit 621266d3a4
1 changed files with 9 additions and 1 deletions
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10
fs/fs.c
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@ -409,6 +409,12 @@ static void automount_mount(const char *path, int instat)
{
struct automount *am;
int ret;
static int in_automount;
if (in_automount)
return;
in_automount++;
list_for_each_entry(am, &automount_list, list) {
int len_path = strlen(path);
@ -444,8 +450,10 @@ static void automount_mount(const char *path, int instat)
else
automount_remove(am->path);
return;
break;
}
in_automount--;
}
BAREBOX_MAGICVAR(automount_path, "mountpath passed to automount scripts");