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    Subject[22/75] binary_sysctl(): fix memory leak
    3.1-stable review patch.  If anyone has any objections, please let me know.


    From: Michel Lespinasse <>

    commit 3d3c8f93a237b64580c5c5e138edeb1377e98230 upstream.

    binary_sysctl() calls sysctl_getname() which allocates from names_cache
    slab usin __getname()

    The matching function to free the name is __putname(), and not putname()
    which should be used only to match getname() allocations.

    This is because when auditing is enabled, putname() calls audit_putname
    *instead* (not in addition) to __putname(). Then, if a syscall is in
    progress, audit_putname does not release the name - instead, it expects
    the name to get released when the syscall completes, but that will happen
    only if audit_getname() was called previously, i.e. if the name was
    allocated with getname() rather than the naked __getname(). So,
    __getname() followed by putname() ends up leaking memory.

    Signed-off-by: Michel Lespinasse <>
    Acked-by: Al Viro <>
    Cc: Christoph Hellwig <>
    Cc: Eric Paris <>
    Signed-off-by: Andrew Morton <>
    Signed-off-by: Linus Torvalds <>
    Signed-off-by: Greg Kroah-Hartman <>

    kernel/sysctl_binary.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/kernel/sysctl_binary.c
    +++ b/kernel/sysctl_binary.c
    @@ -1354,7 +1354,7 @@ static ssize_t binary_sysctl(const int *

    - putname(pathname);
    + __putname(pathname);
    return result;

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      Last update: 2012-01-04 00:07    [W:0.023 / U:8.424 seconds]
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