Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Free histogram the var ref when its initialization fails create_var_ref() allocates a VAR_REF hist_field and then calls init_var_ref() to fill it in. When that fails the field is leaked. commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy var_refs") made destroy_hist_field() return early for HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's var_refs[] array instead. create_var_ref() adds the field to that array only after init_var_ref() has succeeded, so on this path the field is in neither place and nothing frees it. The call was correct when it was written, before var refs were taken out of destroy_hist_field(). init_var_ref() cannot free it either. The caller owns the field, so init_var_ref() undoes only its own string allocations and leaves the field alone. Freeing it there would leave create_var_ref() passing freed memory to destroy_hist_field(), which reads its flags. Call __destroy_hist_field(), which frees the field without consulting the flag.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 608b7751926ec08fae6a1ac4e7308195da68c362affected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 4870f9071c9ea3c1423a07741b85a794db30d672affected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 352f84a381e7b4651b30366e93cb858f3fa9c91aaffected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 4924328d6991f25b65bb7c8ff5d56c2a9b254851affected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 74375caa20fe5165807b4334c783d1790b01f02aaffected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 222abcbe7866fef04563b6eb89fb21f627dcbc77affected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < a69baeac38677270656e85753d93856a076dee57affected656fe2ba85e81d00e4447bf77b8da2be3c47acb2 to < 516001d53e6b2ea95a251ee2ef54a1a689a3fd58affected836717841a30d7845cdf9cb806ee0ff3bfa7135aaffected4.19.100 to < 4.20affected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/608b7751926ec08fae6a1ac4e7308195da68c362 ↗
- https://git.kernel.org/stable/c/4870f9071c9ea3c1423a07741b85a794db30d672 ↗
- https://git.kernel.org/stable/c/352f84a381e7b4651b30366e93cb858f3fa9c91a ↗
- https://git.kernel.org/stable/c/4924328d6991f25b65bb7c8ff5d56c2a9b254851 ↗
- https://git.kernel.org/stable/c/74375caa20fe5165807b4334c783d1790b01f02a ↗
- https://git.kernel.org/stable/c/222abcbe7866fef04563b6eb89fb21f627dcbc77 ↗
- https://git.kernel.org/stable/c/a69baeac38677270656e85753d93856a076dee57 ↗
- https://git.kernel.org/stable/c/516001d53e6b2ea95a251ee2ef54a1a689a3fd58 ↗