Bug 2313089 (CVE-2024-46741)

Summary: CVE-2024-46741 kernel: misc: fastrpc: Fix double free of 'buf' in error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2313183    
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Description OSIDB Bzimport 2024-09-18 08:21:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: Fix double free of 'buf' in error path

smatch warning:
drivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf'

In fastrpc_req_mmap() error path, the fastrpc buffer is freed in
fastrpc_req_munmap_impl() if unmap is successful.

But in the end, there is an unconditional call to fastrpc_buf_free().
So the above case triggers the double free of fastrpc buf.
Comment 1 Michal Findra 2024-09-18 09:28:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091835-CVE-2024-46741-4ce7@gregkh/T