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authorJeff Garzik <jeff@garzik.org>2006-10-17 00:10:39 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-17 08:18:49 -0700
commit04518bfe8eac2e82b476fb2b0093527adc2bc791 (patch)
tree4b90b18cb60d1db94325675886b74f0aa0bf346f /drivers/isdn/pcbit
parent078d396598401dbaa88d5f95ec45579f9d3dce0e (diff)
[PATCH] ISDN: fix drivers, by handling errors thrown by ->readstat()
This is a particularly ugly on-failure bug, possibly security, since the lack of error handling here is covering up another class of bug: failure to handle copy_to_user() return values. The I4L API function ->readstat() returns an integer, and by looking at several existing driver implementations, it is clear that a negative return value was meant to indicate an error. Given that several drivers already return a negative value indicating an errno-style error, the current code would blindly accept that [negative] value as a valid amount of bytes read. Obvious damage ensues. Correcting ->readstat() handling to properly notice errors fixes the existing code to work correctly on error, and enables future patches to more easily indicate errors during operation. Signed-off-by: Jeff Garzik <jeff@garzik.org> Cc: Karsten Keil <kkeil@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/isdn/pcbit')
0 files changed, 0 insertions, 0 deletions