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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-08-27 07:35:47 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-30 21:51:29 -0700
commite0ad2cd8ff7fb957be867d17d44fb4b7093c91bd (patch)
tree92a9c689dfe2b193c529b69facf36b5743c4ba82 /arch/powerpc/sysdev/qe_lib/qe.c
parentb9caaabb995c6ff103e2457b9a36930b9699de7c (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/qe.c')
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