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tmpfs: fix oops on mounts with mpol=default

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Fix an 'oops' when a tmpfs mount point is mounted with the mpol=default
mempolicy.

Upon remounting a tmpfs mount point with 'mpol=default' option, the mount
code crashed with a null pointer dereference.  The initial problem report
was on 2.6.27, but the problem exists in mainline 2.6.34-rc as well.  On
examining the code, we see that mpol_new returns NULL if default mempolicy
was requested.  This 'NULL' mempolicy is accessed to store the node mask
resulting in oops.

The following patch fixes it.

Signed-off-by: Ravikiran Thirumalai <[email protected]>
Signed-off-by: KOSAKI Motohiro <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: Lee Schermerhorn <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ravikiran G Thirumalai 2010-03-23 13:35:28 -07:00 • committed by Linus Torvalds
commit 413b43deab
1 changed files with 7 additions and 2 deletions
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9
mm/mempolicy.c
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@ -2215,10 +2215,15 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
goto out;
mode = MPOL_PREFERRED;
break;
case MPOL_DEFAULT:
/*
* Insist on a empty nodelist
*/
if (!nodelist)
err = 0;
goto out;
/*
* case MPOL_BIND: mpol_new() enforces non-empty nodemask.
* case MPOL_DEFAULT: mpol_new() enforces empty nodemask, ignores flags.
*/
}