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CVE-2024-35844

f2fs: compress: fix reserve_cblocks counting error when out of space PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix reserve_cblocks counting error when out of space When a file only needs one direct_node, performing the following operations will cause the file to be unrepairable: unisoc # ./f2fs_io compress test.apk unisoc #df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.2M 100% /data unisoc # ./f2fs_io release_cblocks test.apk 924 unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 4.8M 100% /data unisoc # dd if=/dev/random of=file4 bs=1M count=3 3145728 bytes (3.0 M) copied, 0.025 s, 120 M/s unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device adb reboot unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 0 This is because the file has only one direct_node. After returning to -ENOSPC, reserved_blocks += ret will not be executed. As a result, the reserved_blocks at this time is still 0, which is not the real number of reserved blocks. Therefore, fsck cannot be set to repair the file. After this patch, the fsck flag will be set to fix this problem. unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device adb reboot then fsck will be executed unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 924

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected c75488fb4d82b697f381f855bf5b16779df440aa before fa3ac8b1a227d9b470b87972494293348b5839ee; affected c75488fb4d82b697f381f855bf5b16779df440aa before 889846dfc8ee2cf31148a44bfd2faeb2faadc685; affected c75488fb4d82b697f381f855bf5b16779df440aa before f0bf89e84c3afb79d7a3a9e4bc853ad6a3245c0a; affected c75488fb4d82b697f381f855bf5b16779df440aa before 569c198c9e2093fd29cc071856a4e548fda506bc; affected c75488fb4d82b697f381f855bf5b16779df440aa before fc0aed88afbf6f606205129a7466eebdf528e3f3; affected c75488fb4d82b697f381f855bf5b16779df440aa before 2f6d721e14b69d6e1251f69fa238b48e8374e25f
Linux / Linuxaffected 5.8; unaffected 0 before 5.8; unaffected 5.15.153 through 5.15.*; unaffected 6.1.83 through 6.1.*; unaffected 6.6.23 through 6.6.*; unaffected 6.7.11 through 6.7.*; unaffected 6.8.2 through 6.8.*; unaffected 6.9 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.