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authorHATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>2013-10-16 13:47:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-10-16 21:35:53 -0700
commit2cbe3b0af82279f14cfb3195f2406651f28ee9b8 (patch)
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parente3b6c655b91e01a1dade056cfa358581b47a5351 (diff)
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procfs: fix unintended truncation of returned mapped address
Currently, proc_reg_get_unmapped_area truncates upper 32-bit of the mapped virtual address returned from get_unmapped_area method in pde->proc_fops due to the variable rv of signed integer on x86_64. This is too small to have vitual address of unsigned long on x86_64 since on x86_64, signed integer is of 4 bytes while unsigned long is of 8 bytes. To fix this issue, use unsigned long instead. Fixes a regression added in commit c4fe24485729 ("sparc: fix PCI device proc file mmap(2)"). Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: David S. Miller <davem@davemloft.net> Tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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