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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-08-27 07:35:47 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-08-30 21:51:29 -0700 |
| commit | e0ad2cd8ff7fb957be867d17d44fb4b7093c91bd (patch) | |
| tree | 92a9c689dfe2b193c529b69facf36b5743c4ba82 /arch/powerpc/sysdev/qe_lib/gpio.c | |
| parent | b9caaabb995c6ff103e2457b9a36930b9699de7c (diff) | |
ucc_geth: Fix NULL pointer dereference in uec_get_ethtool_stats()
In commit 3e73fc9a12679a546284d597c1f19165792d0b83 ("ucc_geth: Fix IO
memory (un)mapping code") I fixed ug_regs IO memory leak by properly
freeing the allocated memory. But ethtool_stats() callback doesn't
check for ug_regs being NULL, and that causes following oops if
'ethtool -S' is executed on a closed eth device:
Unable to handle kernel paging request for data at address 0x00000180
Faulting instruction address: 0xc0208228
Oops: Kernel access of bad area, sig: 11 [#1]
...
NIP [c0208228] uec_get_ethtool_stats+0x38/0x140
LR [c02559a0] ethtool_get_stats+0xf8/0x23c
Call Trace:
[ef87bcd0] [c025597c] ethtool_get_stats+0xd4/0x23c (unreliable)
[ef87bd00] [c025706c] dev_ethtool+0xfe8/0x11bc
[ef87be00] [c0252b5c] dev_ioctl+0x454/0x6a8
...
---[ end trace 77fff1162a9586b0 ]---
Segmentation fault
This patch fixes the issue.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/powerpc/sysdev/qe_lib/gpio.c')
0 files changed, 0 insertions, 0 deletions