GoogleOSV:CVE-2021-47353CVE-2021-47353
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In the Linux kernel, the following vulnerability has been resolved: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL. Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails. This fix adds a check to validate the value of epos.bh.
References
git.kernel.org/linus/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43
git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238
git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c
git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5
git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9
git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6
git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b
git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02
git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d
git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43
ubuntu.com/security/CVE-2021-47353
www.cve.org/CVERecord?id=CVE-2021-47353
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