CVE-2021-47077

published 2024-03-01

CVE-2021-47077: In the Linux kernel, the following vulnerability has been resolved: scsi: qedf: Add pointer checks in qedf_update_link_speed() The following trace was…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

scsi: qedf: Add pointer checks in qedf_update_link_speed()

The following trace was observed:

[ 14.042059] Call Trace:
[ 14.042061]
[ 14.042068] qedf_link_update+0x144/0x1f0 [qedf]
[ 14.042117] qed_link_update+0x5c/0x80 [qed]
[ 14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed]
[ 14.042155] ? qed_set_ptt+0x70/0x80 [qed]
[ 14.042170] ? qed_set_ptt+0x70/0x80 [qed]
[ 14.042186] ? qed_rd+0x13/0x40 [qed]
[ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed]
[ 14.042221] ? qed_set_ptt+0x70/0x80 [qed]
[ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed]
[ 14.042245] tasklet_action_common.isra.14+0x5a/0x100
[ 14.042250] __do_softirq+0xe4/0x2f8
[ 14.042253] irq_exit+0xf7/0x100
[ 14.042255] do_IRQ+0x7f/0xd0
[ 14.042257] common_interrupt+0xf/0xf
[ 14.042259]

API qedf_link_update() is getting called from QED but by that time
shost_data is not initialised. This results in a NULL pointer dereference
when we try to dereference shost_data while updating supported_speeds.

Add a NULL pointer check before dereferencing shost_data.

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.10.40-1 (bookworm)	linux 5.10.40-1 (bookworm)
linux	linux	—	—
linux	linux	>= 61d8658b4a435eac729966cc94cdda077a8df5cd < a6362a737572f66051deb7637f3f77ddf7a4402f	a6362a737572f66051deb7637f3f77ddf7a4402f
linux	linux	>= 61d8658b4a435eac729966cc94cdda077a8df5cd < 11014efcec378bb0050a6cf08eaf375e3693400a	11014efcec378bb0050a6cf08eaf375e3693400a
linux	linux	>= 61d8658b4a435eac729966cc94cdda077a8df5cd < 73578af92a0fae6609b955fcc9113e50e413c80f	73578af92a0fae6609b955fcc9113e50e413c80f
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.40-1	5.10.40-1
linux	linux_kernel	>= 0 < 5.10.40-1	5.10.40-1
linux	linux_kernel	>= 0 < 5.10.40-1	5.10.40-1
linux	linux_kernel	>= 0 < 5.10.40-1	5.10.40-1
linux	linux_kernel	>= 4.11 < 5.10.40	5.10.40
linux	linux_kernel	>= 5.11 < 5.12.7	5.12.7

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-476