Date: Thu, 15 Aug 2024 19:06:19 GMT From: Stefan =?utf-8?Q?E=C3=9Fer?= <se@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: e8f52a86ee27 - stable/13 - msdosfs: fix cluster limit when mounting FAT-16 file systems Message-ID: <202408151906.47FJ6JBq092151@gitrepo.freebsd.org>
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The branch stable/13 has been updated by se: URL: https://cgit.FreeBSD.org/src/commit/?id=e8f52a86ee279a1270e31bc5bad436939e44f555 commit e8f52a86ee279a1270e31bc5bad436939e44f555 Author: Stefan Eßer <se@FreeBSD.org> AuthorDate: 2024-08-09 17:26:27 +0000 Commit: Stefan Eßer <se@FreeBSD.org> CommitDate: 2024-08-15 19:05:50 +0000 msdosfs: fix cluster limit when mounting FAT-16 file systems The maximum cluster number was calculated based on the number of data cluters that fit in the givem partition size and the size of the FAT area. This limit did not take into account that the highest 10 cluster numbers are reserved and must not be used for files. PR: 280347 Reported by: pho@FreeBSD.org (cherry picked from commit 45d4e82bf61f91792142a2b9e2af657dab8500fd) --- sys/fs/msdosfs/msdosfs_vfsops.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c index b5392e62b578..4326dc1f0a6d 100644 --- a/sys/fs/msdosfs/msdosfs_vfsops.c +++ b/sys/fs/msdosfs/msdosfs_vfsops.c @@ -724,7 +724,9 @@ mountmsdosfs(struct vnode *odevvp, struct mount *mp) } } - clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv ; + clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; + if (clusters >= (CLUST_RSRVD & pmp->pm_fatmask)) + clusters = CLUST_RSRVD & pmp->pm_fatmask; if (pmp->pm_maxcluster >= clusters) { #ifdef MSDOSFS_DEBUG printf("Warning: number of clusters (%ld) exceeds FAT "
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