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| author | Frank Rowand <frank.rowand@am.sony.com> | 2016-06-16 10:51:46 -0700 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2016-06-24 15:16:10 -0500 |
| commit | d9fc880723321dbf16b2981e3f3e916b73942210 (patch) | |
| tree | 0e483dcd218e52726f6669f74f64e036eb9f9420 /drivers/of/of_private.h | |
| parent | e1bcbee6f95301197e1039b4e4104cbdc4a332a6 (diff) | |
| download | linux-d9fc880723321dbf16b2981e3f3e916b73942210.tar.gz | |
of: fix memory leak related to safe_name()
Fix a memory leak resulting from memory allocation in safe_name().
This patch fixes all call sites of safe_name().
Mathieu Malaterre reported the memory leak on boot:
On my PowerMac device-tree would generate a duplicate name:
[ 0.023043] device-tree: Duplicate name in PowerPC,G4@0, renamed to "l2-cache#1"
in this case a newly allocated name is generated by `safe_name`. However
in this case it is never deallocated.
The bug was found using kmemleak reported as:
unreferenced object 0xdf532e60 (size 32):
comm "swapper", pid 1, jiffies 4294892300 (age 1993.532s)
hex dump (first 32 bytes):
6c 32 2d 63 61 63 68 65 23 31 00 dd e4 dd 1e c2 l2-cache#1......
ec d4 ba ce 04 ec cc de 8e 85 e9 ca c4 ec cc 9e ................
backtrace:
[<c02d3350>] kvasprintf+0x64/0xc8
[<c02d3400>] kasprintf+0x4c/0x5c
[<c0453814>] safe_name.isra.1+0x80/0xc4
[<c04545d8>] __of_attach_node_sysfs+0x6c/0x11c
[<c075f21c>] of_core_init+0x8c/0xf8
[<c0729594>] kernel_init_freeable+0xd4/0x208
[<c00047e8>] kernel_init+0x24/0x11c
[<c00158ec>] ret_from_kernel_thread+0x5c/0x64
Link: https://bugzilla.kernel.org/show_bug.cgi?id=120331
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Reported-by: mathieu.malaterre@gmail.com
Tested-by: Mathieu Malaterre <mathieu.malaterre@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of/of_private.h')
| -rw-r--r-- | drivers/of/of_private.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 829469faeb23..18bbb4517e25 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -83,6 +83,9 @@ extern int __of_attach_node_sysfs(struct device_node *np); extern void __of_detach_node(struct device_node *np); extern void __of_detach_node_sysfs(struct device_node *np); +extern void __of_sysfs_remove_bin_file(struct device_node *np, + struct property *prop); + /* iterators for transactions, used for overlays */ /* forward iterator */ #define for_each_transaction_entry(_oft, _te) \ |