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| author | Jeff Garzik <jeff@garzik.org> | 2006-10-17 09:10:39 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-17 17:18:49 +0200 |
| commit | 04518bfe8eac2e82b476fb2b0093527adc2bc791 (patch) | |
| tree | 4b90b18cb60d1db94325675886b74f0aa0bf346f /drivers/isdn/capi/capidrv.c | |
| parent | [PATCH] drivers/isdn/isdnloop: save_flags()/cli(), restore_flags() replaced a... (diff) | |
| download | linux-04518bfe8eac2e82b476fb2b0093527adc2bc791.tar.xz linux-04518bfe8eac2e82b476fb2b0093527adc2bc791.zip | |
[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/capi/capidrv.c')
0 files changed, 0 insertions, 0 deletions