https://github.com/torvalds/linux
Revision 74dae4278546b897eb81784fdfcce872ddd8b2b8 authored by Jan Kara on 19 February 2016, 05:33:21 UTC, committed by Theodore Ts'o on 19 February 2016, 05:33:21 UTC
Competing overwrite DIO in dioread_nolock mode will just overwrite pointer to io_end in the inode. This may result in data corruption or extent conversion happening from IO completion interrupt because we don't properly set buffer_defer_completion() when unlocked DIO races with locked DIO to unwritten extent. Since unlocked DIO doesn't need io_end for anything, just avoid allocating it and corrupting pointer from inode for locked DIO. A cleaner fix would be to avoid these games with io_end pointer from the inode but that requires more intrusive changes so we leave that for later. Cc: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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History 
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Tip revision: 74dae4278546b897eb81784fdfcce872ddd8b2b8 authored by Jan Kara on 19 February 2016, 05:33:21 UTC
ext4: fix crashes in dioread_nolock mode
ext4: fix crashes in dioread_nolock mode
Tip revision: 74dae42
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitignore | -rw-r--r-- | 1.2 KB |
| .mailmap | -rw-r--r-- | 5.5 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 95.4 KB |
| Kbuild | -rw-r--r-- | 2.6 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 337.2 KB |
| Makefile | -rw-r--r-- | 53.7 KB |
| README | -rw-r--r-- | 18.2 KB |
| REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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