CVEs-PoC/2021/CVE-2021-47353.md

CVE-2021-47353

Description

In the Linux kernel, the following vulnerability has been resolved:udf: Fix NULL pointer dereference in udf_symlink functionIn function udf_symlink, epos.bh is assigned with the value returnedby udf_tgetblk. The function udf_tgetblk is defined in udf/misc.cand returns the value of sb_getblk function that could be NULL.Then, epos.bh is used without any check, causing a possibleNULL pointer dereference when sb_getblk fails.This fix adds a check to validate the value of epos.bh.

POC

Reference

• https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c

Github

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