https://github.com/torvalds/linux
Revision f86b0aaad741c45aba5a84a27277dd56a96808ba authored by Kalesh Singh on 18 November 2021, 01:15:42 UTC, committed by Steven Rostedt (VMware) on 18 November 2021, 18:53:43 UTC
Calling destroy_hist_field() on an expression will recursively free
any operands associated with the expression. If during expression
parsing the operands of the expression are already set when an error
is encountered, there is no need to explicity free the operands. Doing
so will result in destroy_hist_field() being called twice for the
operands and lead to a use-after-free (UAF) error.
If the operands are associated with the expression, only call
destroy_hist_field() on the expression since the operands will be
recursively freed.
Link: https://lore.kernel.org/all/CAHk-=wgcrEbFgkw9720H3tW-AhHOoEKhYwZinYJw4FpzSaJ6_Q@mail.gmail.com/
Link: https://lkml.kernel.org/r/20211118011542.1420131-1-kaleshsingh@google.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Fixes: 8b5d46fd7a38 ("tracing/histogram: Optimize division by constants")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 parent 8ab7745
Tip revision: f86b0aaad741c45aba5a84a27277dd56a96808ba authored by Kalesh Singh on 18 November 2021, 01:15:42 UTC
tracing/histogram: Fix UAF in destroy_hist_field()
tracing/histogram: Fix UAF in destroy_hist_field()
Tip revision: f86b0aa
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| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
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| COPYING | -rw-r--r-- | 496 bytes |
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| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 615.6 KB |
| Makefile | -rw-r--r-- | 64.1 KB |
| README | -rw-r--r-- | 727 bytes |
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