scsi: target: Fix NULL pointer dereference in core_scsi3_decode_spec_i_port()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix NULL pointer dereference in core_scsi3_decode_spec_i_port() The function core_scsi3_decode_spec_i_port(), in its error code path, unconditionally calls core_scsi3_lunacl_undepend_item() passing the dest_se_deve pointer, which may be NULL. This can lead to a NULL pointer dereference if dest_se_deve remains unset. SPC-3 PR SPEC_I_PT: Unable to locate dest_tpg Unable to handle kernel paging request at virtual address dfff800000000012 Call trace: core_scsi3_lunacl_undepend_item+0x2c/0xf0 [target_core_mod] (P) core_scsi3_decode_spec_i_port+0x120c/0x1c30 [target_core_mod] core_scsi3_emulate_pro_register+0x6b8/0xcd8 [target_core_mod] target_scsi3_emulate_pr_out+0x56c/0x840 [target_core_mod] Fix this by adding a NULL check before calling core_scsi3_lunacl_undepend_item()

References

• https://git.kernel.org/stable/c/70ddb8133fdb512d4b1f2b4fd1c9e518514f182c
• https://git.kernel.org/stable/c/1129e0e0a833acf90429e0f13951068d5f026e4f
• https://git.kernel.org/stable/c/1627dda4d70ceb1ba62af2e401af73c09abb1eb5
• https://git.kernel.org/stable/c/55dfffc5e94730370b08de02c0cf3b7c951bbe9e
• https://git.kernel.org/stable/c/7296c938df2445f342be456a6ff0b3931d97f4e5
• https://git.kernel.org/stable/c/c412185d557578d3f936537ed639c4ffaaed4075
• https://git.kernel.org/stable/c/d8ab68bdb294b09a761e967dad374f2965e1913f