cve-2021-47353
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2024-12-19 07:40
Severity ?
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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En la funci\u00f3n udf_symlink, a epos.bh se le asigna el valor devuelto por udf_tgetblk. La funci\u00f3n udf_tgetblk est\u00e1 definida en udf/misc.c y devuelve el valor de la funci\u00f3n sb_getblk que podr\u00eda ser NULL. Luego, epos.bh se usa sin ninguna verificaci\u00f3n, lo que provoca una posible desreferencia del puntero NULL cuando falla sb_getblk. 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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