https://github.com/torvalds/linux
Revision 3d63b7e4ae0dc5e02d28ddd2fa1f945defc68d81 authored by Tetsuo Handa on 26 May 2018, 00:53:13 UTC, committed by Greg Kroah-Hartman on 28 June 2018, 12:30:16 UTC
syzbot is reporting stalls at n_tty_receive_char_special() [1]. This is
because comparison is not working as expected since ldata->read_head can
change at any moment. Mitigate this by explicitly masking with buffer size
when checking condition for "while" loops.
[1] https://syzkaller.appspot.com/bug?id=3d7481a346958d9469bebbeb0537d5f056bdd6e8
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+18df353d7540aa6b5467@syzkaller.appspotmail.com>
Fixes: bc5a5e3f45d04784 ("n_tty: Don't wrap input buffer indices at buffer size")
Cc: stable <stable@vger.kernel.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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History 
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Tip revision: 3d63b7e4ae0dc5e02d28ddd2fa1f945defc68d81 authored by Tetsuo Handa on 26 May 2018, 00:53:13 UTC
n_tty: Fix stall at n_tty_receive_char_special().
n_tty: Fix stall at n_tty_receive_char_special().
Tip revision: 3d63b7e
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| include | ||
| init | ||
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| samples | ||
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| virt | ||
| .clang-format | -rw-r--r-- | 12.8 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.5 KB |
| .mailmap | -rw-r--r-- | 9.3 KB |
| COPYING | -rw-r--r-- | 423 bytes |
| CREDITS | -rw-r--r-- | 96.3 KB |
| Kbuild | -rw-r--r-- | 2.2 KB |
| Kconfig | -rw-r--r-- | 321 bytes |
| MAINTAINERS | -rw-r--r-- | 449.0 KB |
| Makefile | -rw-r--r-- | 58.3 KB |
| README | -rw-r--r-- | 800 bytes |
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